This comprehensive Technical SEO Audit Guide identifies and explains over 150 common issues flagged by website audit tools. Designed specifically for non-technical marketers, this resource bridges the gap between technical SEO jargon and practical implementation. Each issue includes a clear description, responsibility assignment, and valuable external resources for resolution.
Technical SEO forms the foundation of any successful digital marketing strategy, yet it often presents significant challenges for marketing teams without technical expertise. This guide serves as a translator between audit tool findings and actionable insights, empowering marketers to collaborate effectively with developers, designers, and content creators.
Each technical issue is categorized by severity and includes responsibility indicators to quickly identify who should handle the fix, whether that’s a developer, content creator, SEO specialist, or digital marketer. The curated external resources offer in-depth insights into specific problems and step-by-step resolution methods from trusted industry experts.
Use this guide as both a reference when troubleshooting specific issues and as an educational resource to better understand the technical aspects of SEO that impact your website’s performance. Demystifying technical SEO jargon facilitates better communication between team members and ultimately improves your site’s search visibility and user experience.
- 5xx Errors
- 4xx Errors
- Duplicate Title Tags
- Missing Meta Description
- Broken Internal Links
- Pages Blocked from Crawling
- Slow Page Load Speed
- Missing H1 Tag
- Multiple H1 Tags
- Duplicate Content
- Links Have No Anchor Text
- Robots.txt Not Found
- Sitemap Not Found
- Uncompressed JavaScript and CSS Files
- Pages with Low Text-HTML Ratio
- Pages with Long URLs
- Non-secure Pages
- Mixed Content Warnings
- Too Many On-Page Links
- Images Missing Alt Attributes
- Large Page Size
- Redirect Chains and Loops
- Temporary Redirects
- Orphaned Pages
- No Canonical Tag
- Duplicate Meta Descriptions
- Meta Refresh Redirects
- AMP Issues
- Mobile Usability Errors
- Pages with Only One Incoming Internal Link
- Pages with Noindex Tag
- Pages with No Title Tag
- Title Tag Too Long
- Title Tag Too Short
- Meta Description Too Long
- Meta Description Too Short
- Meta Refresh Tag Used
- Pages with Duplicate H1 Tags
- Pages with Duplicate H2 Tags
- Pages with Low Word Count
- Pages with High Word Count
- Pages with Too Many Parameters
- Pages with Session IDs in URLs
- Pages with Uppercase URLs
- Pages with Underscores in URLs
- Pages with Non-ASCII Characters in URLs
- Pages with Query Strings
- Pages with No Favicon
- Pages with No Language Declared
- Pages with No DOCTYPE Declared
- Pages with Deprecated HTML Tags
- Pages with No Sitemap
- Pages with Sitemap Errors
- Pages with Sitemap Not Updated
- Pages with Sitemap Not Submitted
- Pages with No XML Sitemap
- Pages with No Sitemap in Robots.txt
- Pages with No Structured Data
- Pages with Invalid Structured Data
- Pages with No Open Graph Tags
- Pages with No Twitter Card Tags
- Pages with No Hreflang Tag
- Pages with Invalid Hreflang Tag
- Pages with Missing X-Default Hreflang
- Pages with HTTP/2 Not Enabled
- Pages with No Google Analytics
- Pages with No Facebook Pixel
- Pages with No Conversion Tracking
- Pages with No Call to Action
- Pages with No Contact Information
- Pages with No Privacy Policy
- Pages with No Terms of Service
- Pages with No Cookie Policy
- Pages with No About Page
- Pages with No Logo
- Pages with No Copyright Notice
- Pages with No Social Links
- Broken External Images
- Broken External JavaScript
- Broken External CSS
- Pages with Broken Internal Images
- Pages with Broken Internal JavaScript
- Pages with Broken Internal CSS
- Pages with Multiple Meta Robots Tags
- Pages with Conflicting Meta Robots Tags
- Pages with X-Robots-Tag HTTP Header
- Pages with Nofollow Tag
- Pages with No Archive Tag
- Pages with No Snippet Tag
- Pages with No ODP Tag
- Pages with No YDIR Tag
- Pages with No Cache-Control Header
- Pages with No Expires Header
- Pages with No ETag Header
- Pages with No Last-Modified Header
- Pages with No Vary Header
- Pages with No Content-Encoding Header
- Pages with No Transfer-Encoding Header
- Pages with No Accept-Ranges Header
- Pages with No X-Frame-Options Header
- Pages with No X-XSS-Protection Header
- Pages with No X-Content-Type-Options Header
- Pages with No Referrer-Policy Header
- Pages with No Feature-Policy Header
- Pages with No Permissions-Policy Header
- Pages with Broken Video Embeds
- Pages with Blocked JavaScript Files
- Pages with Blocked CSS Files
- Pages with Blocked Images
- Pages with Blocked CSS Resources
- Pages with Blocked JS Resources
- Pages with Blocked Font Files
- Pages with Blocked Video Files
- Pages with Blocked PDF Files
- Pages with Blocked Audio Files
- Pages with Blocked SVG Files
- Pages with Blocked Iframe Content
- Pages with Blocked JSON Files
- Pages with Blocked XML Files
- AMP Page Missing Canonical Tag
- AMP Page Uses Disallowed HTML Tag
- AMP Page Missing Required Script
- AMP Page Missing Required Meta Charset
- AMP Page Missing Viewport Meta Tag
- AMP Page Uses Prohibited JavaScript
- HTTP 410 Gone Error
- HTTP 451 Unavailable For Legal Reasons
- HTTP 429 Too Many Requests
- HTTP 500 Internal Server Error
- HTTP 502 Bad Gateway
- HTTP 503 Service Unavailable
- HTTP 410 Gone Error
- Invalid URL Syntax or Malformed Links
- Viewport Meta Tag Missing Width or Initial Scale
- HTTP 418 I'm a Teapot
- HTTP 499 Client Closed Request (edge case)
- HTTP 504 Gateway Timeout
- Missing Content-Security-Policy Header (edge case)
- Missing Cross-Origin-Embedder-Policy Header (edge case)
5xx Errors
Severity Level: Error
Category: Crawlability, Technical SEO
Summary
Your server is returning 5xx errors, which means it’s having trouble serving some pages. This prevents users and search engines from accessing your content.
Recommended Fix
Check server logs and fix the underlying problem (overload, misconfiguration, or code errors).
Who Should Fix
Developer
More Information
https://seo-hacker.com/complete-guide-5xx-server-errors/
How to Fix
https://www.lumar.io/blog/best-practice/5xx-server-errors-how-to-find-and-fix-for-seo/
4xx Errors
Severity Level: Error
Category: Crawlability, Technical SEO
Summary
Your site has pages that return 4xx errors (like 404 Not Found), meaning the page doesn’t exist or can’t be reached.
Recommended Fix
Fix or redirect broken URLs, or restore missing pages if needed.
Who Should Fix
Developer, SEO Specialist
More Information
https://trafficthinktank.com/4xx-error/
How to Fix
https://seotwix.com/blog/how-to-fix-pages-returned-4xx-status-code/
Duplicate Title Tags
Severity Level: Warning
Category: On-Page SEO, Meta Tags
Summary
Multiple pages have identical title tags, which can confuse search engines and harm rankings.
Recommended Fix
Make each page’s title tag unique and relevant to its content.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://agencyanalytics.com/kpi-definitions/duplicate-title-tags
How to Fix
https://www.semrush.com/blog/duplicate-title-tags/
Missing Meta Description
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some pages don’t have a meta description, which can reduce click-through rates from search results.
Recommended Fix
Add a unique, relevant meta description to each page.
Who Should Fix
Content Editor
More Information
https://sitebulb.com/hints/on-page/meta-description-is-missing/
How to Fix
https://sitechecker.pro/site-audit-issues/description-is-missing/
Broken Internal Links
Severity Level: Error
Category: Crawlability, Internal Linking
Summary
Some links on your site point to pages that don’t exist, leading to a poor user experience and wasted crawl budget.
Recommended Fix
Update or remove broken internal links.
Who Should Fix
SEO Specialist, Content Editor
More Information
https://www.seoclarity.net/blog/how-to-fix-broken-internal-links
How to Fix
https://searchengineland.com/finding-fixing-broken-internal-links-seo-guide-432788
Pages Blocked from Crawling
Severity Level: Error
Category: Crawlability, Indexability
Summary
Some pages are blocked by robots.txt or meta tags, so search engines can’t access them.
Recommended Fix
Review robots.txt and meta tags to allow search engines to crawl important pages.
Who Should Fix
SEO Specialist, Developer
More Information
https://developers.google.com/search/docs/crawling-indexing/block-indexing
How to Fix
https://rankmath.com/kb/fix-submitted-url-blocked-by-robots-txt-error/
Slow Page Load Speed
Severity Level: Warning
Category: Site Performance, Technical SEO
Summary
Some pages load slowly, which can frustrate users and hurt rankings.
Recommended Fix
Optimize images, reduce scripts, and use caching to speed up your site.
Who Should Fix
Developer
More Information
https://goodmancreatives.com/how-does-page-speed-affect-seo/
How to Fix
https://www.semrush.com/blog/page-speed/
Missing H1 Tag
Severity Level: Warning
Category: On-Page SEO, Content
Summary
Some pages don’t have an H1 heading, which helps search engines understand page content.
Recommended Fix
Add a relevant H1 heading to each page.
Who Should Fix
Content Editor
More Information
https://moz.com/learn/seo/h1-tags
How to Fix
https://sitechecker.pro/site-audit-issues/h1-is-missing/
Multiple H1 Tags
Severity Level: Notice
Category: On-Page SEO, Content
Summary
Some pages have more than one H1 heading, which can confuse search engines.
Recommended Fix
Use only one H1 heading per page, and use subheadings (H2, H3) for other topics.
Who Should Fix
Content Editor
More Information
https://moz.com/learn/seo/h1-tags
How to Fix
https://sitechecker.pro/site-audit-issues/multiple-h1/
Duplicate Content
Severity Level: Error
Category: On-Page SEO, Content
Summary
Some pages have very similar or identical content, which can hurt search rankings.
Recommended Fix
Rewrite or consolidate duplicate content.
Who Should Fix
SEO Specialist, Content Editor
More Information
https://www.semrush.com/blog/duplicate-content/
How to Fix
https://moz.com/learn/seo/duplicate-content
Links Have No Anchor Text
Severity Level: Notice
Category: On-Page SEO, Accessibility
Summary
Some links don’t have descriptive anchor text, making navigation harder for users and search engines.
Recommended Fix
Add clear, descriptive anchor text to all links.
Who Should Fix
Content Editor
More Information
https://sitebulb.com/hints/links/has-an-internal-link-with-no-anchor-text/
How to Fix
https://sitechecker.pro/site-audit-issues/internal-link-no-anchor-text/
Robots.txt Not Found
Severity Level: Notice
Category: Crawlability, Indexability
Summary
Your site doesn’t have a robots.txt file, which helps guide search engines on what to crawl.
Recommended Fix
Create and upload a robots.txt file to your site’s root directory.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.conductor.com/academy/robotstxt/
How to Fix
https://developers.google.com/search/docs/crawling-indexing/robots/create-robots-txt
Sitemap Not Found
Severity Level: Warning
Category: Crawlability, Indexability
Summary
No sitemap.xml file was found, which helps search engines discover your pages.
Recommended Fix
Create and submit a sitemap.xml file.
Who Should Fix
SEO Specialist, Developer
More Information
https://www.semrush.com/blog/xml-sitemap/
How to Fix
https://support.google.com/webmasters/answer/183668
Uncompressed JavaScript and CSS Files
Severity Level: Notice
Category: Site Performance, Technical SEO
Summary
Some JavaScript and CSS files aren’t compressed, which can slow down your site.
Recommended Fix
Enable compression (like Gzip) for these files.
Who Should Fix
Developer
More Information
https://docs.prospect365.com/en/articles/1689963-seo-uncompressed-javascript-and-css-files
How to Fix
https://www.evisio.co/knowledge/how-to-fix-uncompressed-css-and-javascript-files-issues/
Pages with Low Text-HTML Ratio
Severity Level: Notice
Category: On-Page SEO, Content
Summary
Some pages have little text compared to the amount of HTML code, which can affect SEO.
Recommended Fix
Add more relevant content or reduce unnecessary code.
Who Should Fix
Content Editor, Developer
More Information
https://www.semrush.com/blog/thin-content/
How to Fix
https://sitechecker.pro/site-audit-issues/text-to-code-ratio-is-low/
Pages with Long URLs
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some URLs are longer than 200 characters, which can be hard for users and search engines.
Recommended Fix
Shorten URLs to be concise and descriptive.
Who Should Fix
SEO Specialist, Developer
More Information
https://www.alliai.com/seo-ranking-factors/url-length
How to Fix
https://www.evisio.co/knowledge/how-do-you-fix-link-urls-that-are-too-long/
Non-secure Pages
Severity Level: Error
Category: HTTPS Implementation, Security
Summary
Some pages are served over HTTP, not HTTPS, which is less secure and can hurt rankings.
Recommended Fix
Install an SSL certificate and redirect all HTTP pages to HTTPS.
Who Should Fix
Developer
More Information
https://www.evisio.co/knowledge/everything-you-need-to-know-about-non-secure-pages/
How to Fix
https://www.semrush.com/blog/redirect-http-to-https/
Mixed Content Warnings
Severity Level: Warning
Category: HTTPS Implementation, Security
Summary
Some pages load resources (like images or scripts) over HTTP on HTTPS pages, causing security warnings.
Recommended Fix
Update all resources to load over HTTPS.
Who Should Fix
Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content
How to Fix
https://kinsta.com/blog/mixed-content-warnings/
Too Many On-Page Links
Severity Level: Notice
Category: On-Page SEO, Internal Linking
Summary
Some pages have too many links, which can dilute authority and confuse users.
Recommended Fix
Reduce the number of links on each page to a reasonable amount.
Who Should Fix
Content Editor, SEO Specialist
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-pages-have-too-many-on-page-links/
Images Missing Alt Attributes
Severity Level: Warning
Category: On-Page SEO, Accessibility
Summary
Some images don’t have alt text, which helps with SEO and accessibility.
Recommended Fix
Add descriptive alt text to all images.
Who Should Fix
Content Editor
More Information
How to Fix
https://sitechecker.pro/site-audit-issues/missing-alt-text/
Large Page Size
Severity Level: Warning
Category: Site Performance, Technical SEO
Summary
Some pages are very large, which can slow down loading times.
Recommended Fix
Compress images and optimize resources to reduce page size.
Who Should Fix
Content Editor, Developer
More Information
https://wp-rocket.me/blog/page-size-seo-performance/
How to Fix
https://requestmetrics.com/web-performance/high-performance-images/
Redirect Chains and Loops
Severity Level: Error
Category: Crawlability, Technical SEO
Summary
Some URLs redirect multiple times or loop, preventing access.
Recommended Fix
Fix or remove unnecessary redirects and resolve redirect loops.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.adido-digital.co.uk/blog/how-redirect-chains-and-loops-can-impact-seo/
How to Fix
https://seotwix.com/blog/how-to-fix-redirect-chains-and-loops/
Temporary Redirects
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some URLs use temporary redirects (302), which may not pass link equity.
Recommended Fix
Use permanent (301) redirects for moved pages.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.searchenginejournal.com/301-vs-302-redirects-seo/299843/
How to Fix
https://seotwix.com/blog/how-to-fix-urls-with-a-temporary-redirect/
Orphaned Pages
Severity Level: Warning
Category: Crawlability, Internal Linking
Summary
Some pages aren’t linked from anywhere on your site, so users and search engines can’t find them.
Recommended Fix
Add internal links to orphaned pages from other relevant pages.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://backlinko.com/orphan-pages
How to Fix
https://ahrefs.com/blog/orphan-pages/
No Canonical Tag
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some pages lack a canonical tag, which helps prevent duplicate content issues.
Recommended Fix
Add a canonical tag to specify the preferred version of the page.
Who Should Fix
SEO Specialist, Developer
More Information
https://moz.com/learn/seo/canonicalization
How to Fix
https://www.authoritylabs.com/solving-canonical-problems/
Duplicate Meta Descriptions
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some pages have identical meta descriptions, which can confuse search engines.
Recommended Fix
Make each meta description unique and relevant to the page.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://quirkydigital.com/why-should-i-avoid-duplicate-meta-descriptions/
How to Fix
https://www.semrush.com/blog/duplicate-meta-descriptions/
Meta Refresh Redirects
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some pages use meta refresh for redirection, which is not recommended for SEO.
Recommended Fix
Replace meta refresh redirects with server-side 301 redirects.
Who Should Fix
Developer
More Information
https://www.conductor.com/academy/redirects/faq/html-meta-redirect-bad-seo/
How to Fix
https://www.evisio.co/knowledge/how-to-fix-a-meta-refresh-redirects-issue/
AMP Issues
Severity Level: Warning
Category: Mobile Optimization, Technical SEO
Summary
Some pages have AMP errors, affecting mobile performance and visibility.
Recommended Fix
Validate AMP pages and fix errors using Google’s AMP tools.
Who Should Fix
Developer, SEO Specialist
More Information
https://sitechecker.pro/site-audit-issues/amp-page-validation-errors/
How to Fix
https://amp.dev/documentation/guides-and-tutorials/start/converting/resolving-errors
Mobile Usability Errors
Severity Level: Error
Category: Mobile Optimization, Technical SEO
Summary
Some pages have mobile usability issues, making them hard to use on phones.
Recommended Fix
Use responsive design and fix mobile-specific errors.
Who Should Fix
Developer
More Information
https://www.hotjar.com/website-problems/mobile/
How to Fix
https://www.ezrankings.com/blog/fix-mobile-usability-issues-get-your-own-mobile-friendly-website/
Pages with Only One Incoming Internal Link
Severity Level: Notice
Category: Internal Linking, Crawlability
Summary
Some pages are only linked from one other page, limiting their visibility.
Recommended Fix
Add more internal links to these pages from relevant content.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://sitebulb.com/hints/links/has-only-one-followed-internal-linking-url/
How to Fix
https://www.evisio.co/knowledge/how-do-i-fix-pages-with-only-one-internal-link/
Pages with Noindex Tag
Severity Level: Warning
Category: Indexability, Meta Tags
Summary
Some pages have a noindex tag, preventing them from appearing in search results.
Recommended Fix
Remove the noindex tag from pages you want indexed.
Who Should Fix
SEO Specialist, Developer
More Information
https://www.wix.com/seo/learn/resource/noindex-tag
How to Fix
https://www.embarque.io/post/fix-excluded-by-noindex-tag-in-google-search-console
Pages with No Title Tag
Severity Level: Error
Category: Meta Tags, On-Page SEO
Summary
Some pages don’t have a title tag, which is essential for SEO and user clarity.
Recommended Fix
Add a relevant title tag to each page.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://sitebulb.com/hints/on-page/title-tag-is-missing/
How to Fix
https://www.evisio.co/knowledge/how-to-fix-a-missing-title-tag-issue/
Title Tag Too Long
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some title tags are too long and may be cut off in search results.
Recommended Fix
Shorten title tags to under 60 characters.
Who Should Fix
Content Editor, SEO Specialist
More Information
How to Fix
https://sitechecker.pro/site-audit-issues/title-too-long/
Title Tag Too Short
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some title tags are too short and may not be descriptive enough.
Recommended Fix
Make title tags more descriptive and relevant.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://moz.com/learn/seo/title-tag
How to Fix
https://sitechecker.pro/site-audit-issues/title-too-short/
Meta Description Too Long
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some meta descriptions are too long and may be truncated in search results.
Recommended Fix
Shorten meta descriptions to 155–160 characters.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://searchengineland.com/seo-meta-descriptions-everything-to-know-447910
How to Fix
Meta Description Too Short
Severity Level: Warning
Category: Meta Tags, On-Page SEO
Summary
Some meta descriptions are too short and may not be descriptive enough.
Recommended Fix
Make meta descriptions more descriptive and relevant.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://sitebulb.com/hints/on-page/meta-description-length-too-short/
How to Fix
https://yoast.com/meta-descriptions/
Meta Refresh Tag Used
Severity Level: Notice
Category: Meta Tags, Technical SEO
Summary
Some pages use the meta refresh tag, which is not recommended for SEO.
Recommended Fix
Replace meta refresh tags with proper server-side redirects.
Who Should Fix
Developer
More Information
https://www.alliai.com/seo-glossary/refresh-tag
How to Fix
https://seotwix.com/blog/how-to-fix-pages-have-a-meta-refresh-tag/
Pages with Duplicate H1 Tags
Severity Level: Warning
Category: On-Page SEO, Content
Summary
Some pages have duplicate H1 tags, which can confuse search engines.
Recommended Fix
Use a unique H1 tag for each page.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://sitechecker.pro/site-audit-issues/h1-duplicates/
How to Fix
https://sitechecker.pro/site-audit-issues/multiple-h1/
Pages with Duplicate H2 Tags
Severity Level: Notice
Category: On-Page SEO, Content
Summary
Some pages have duplicate H2 tags, which can confuse search engines.
Recommended Fix
Use unique H2 tags for each section of content.
Who Should Fix
Content Editor
More Information
https://www.alliai.com/seo-glossary/h2-tag
How to Fix
https://www.screamingfrog.co.uk/seo-spider/issues/h2/h2-duplicate/
Pages with Low Word Count
Severity Level: Warning
Category: On-Page SEO, Content
Summary
Some pages have very little content, which can hurt SEO.
Recommended Fix
Add more relevant content to these pages.
Who Should Fix
Content Editor
More Information
https://www.semrush.com/blog/thin-content/
How to Fix
https://faithhanan.com/fix-your-low-website-word-count/
Pages with High Word Count
Severity Level: Notice
Category: On-Page SEO, Content
Summary
Some pages have a very high word count, which may be hard for users to read.
Recommended Fix
Break up long content with headings, lists, or images.
Who Should Fix
Content Editor
More Information
https://aioseo.com/word-count-for-seo/
How to Fix
https://aioseo.com/word-count-for-seo/
Pages with Too Many Parameters
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some URLs have too many parameters, which can cause crawl issues.
Recommended Fix
Reduce the number of URL parameters or use canonical tags.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.searchenginejournal.com/technical-seo/url-parameter-handling/
How to Fix
https://seotwix.com/blog/how-to-fix-pages-have-too-many-parameters-in-their-urls/
Pages with Session IDs in URLs
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some URLs use session IDs, which can create duplicate content.
Recommended Fix
Use cookies or other methods to track sessions instead.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.link-assistant.com/seo-wiki/session-id/
How to Fix
https://www.flyrank.com/blogs/seo-hub/how-to-handle-duplicate-content-caused-by-session-ids
Pages with Uppercase URLs
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some URLs use uppercase letters, which can cause duplicate content issues.
Recommended Fix
Use lowercase URLs consistently.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.seoptimer.com/blog/url-capitalization/
How to Fix
https://www.goinflow.com/blog/redirect-uppercase-urls-to-lowercase/
Pages with Underscores in URLs
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some URLs use underscores instead of hyphens, which is less readable for users and search engines.
Recommended Fix
Use hyphens in URLs instead of underscores.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.stanventures.com/blog/underscore-in-url/
How to Fix
https://www.stanventures.com/blog/underscore-in-url/
Pages with Non-ASCII Characters in URLs
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some URLs contain non-ASCII characters, which can cause crawl issues.
Recommended Fix
Use only standard ASCII characters in URLs.
Who Should Fix
Developer, SEO Specialist
More Information
https://jemsu.com/what-are-the-implications-of-non-ascii-characters-in-url-on-seo-in-2024/
How to Fix
https://sitechecker.pro/site-audit-issues/url-contains-non-ascii-characters/
Pages with Query Strings
Severity Level: Notice
Category: Crawlability, Technical SEO
Summary
Some URLs use query strings, which can cause duplicate content or crawl issues.
Recommended Fix
Minimize query strings or use canonical tags.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.shopify.com/blog/url-parameters
How to Fix
https://www.orbitmedia.com/blog/query-string-seo/
Pages with No Favicon
Severity Level: Notice
Category: Technical SEO, User Experience
Summary
Some pages don’t have a favicon, which helps with branding and user experience.
Recommended Fix
Add a favicon to your website.
Who Should Fix
Developer, Content Editor
More Information
https://www.squarespace.com/blog/what-is-a-favicon
How to Fix
https://www.w3schools.com/html/html_favicon.asp
Pages with No Language Declared
Severity Level: Notice
Category: Technical SEO, Accessibility
Summary
Some pages don’t declare a language, which can affect accessibility and SEO.
Recommended Fix
Add a lang attribute to the HTML tag.
Who Should Fix
Developer
More Information
https://linkilo.co/blog/html-lang-attribute/
How to Fix
https://dequeuniversity.com/rules/axe/4.2/html-has-lang
Pages with No DOCTYPE Declared
Severity Level: Notice
Category: Technical SEO, Accessibility
Summary
Some pages don’t declare a DOCTYPE, which can affect browser rendering.
Recommended Fix
Add a DOCTYPE declaration to the top of each HTML file.
Who Should Fix
Developer
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-pages-dont-have-doctype-declared/
Pages with Deprecated HTML Tags
Severity Level: Notice
Category: Technical SEO, Accessibility
Summary
Some pages use deprecated HTML tags, which can cause issues with modern browsers.
Recommended Fix
Replace deprecated tags with modern HTML equivalents.
Who Should Fix
Developer
More Information
https://www.ranktracker.com/deprecated-html-tags-test/
How to Fix
https://codedamn.com/news/frontend/how-to-replace-outdated-deprecated-html-tags
Pages with No Sitemap
Severity Level: Warning
Category: Crawlability, Indexability
Summary
Some sites don’t have a sitemap, which helps search engines find your pages.
Recommended Fix
Create and submit a sitemap.xml file.
Who Should Fix
SEO Specialist, Developer
More Information
How to Fix
https://developers.google.com/search/docs/crawling-indexing/sitemaps/build-sitemap
Pages with Sitemap Errors
Severity Level: Warning
Category: Crawlability, Indexability
Summary
Your sitemap contains errors that may prevent search engines from indexing your pages.
Recommended Fix
Fix sitemap errors and resubmit.
Who Should Fix
SEO Specialist, Developer
More Information
How to Fix
https://seranking.com/blog/fixing-sitemap-errors/
Pages with Sitemap Not Updated
Severity Level: Notice
Category: Crawlability, Indexability
Summary
Your sitemap hasn’t been updated recently, which may affect indexing.
Recommended Fix
Update your sitemap regularly.
Who Should Fix
SEO Specialist, Developer
More Information
How to Fix
https://slickplan.com/blog/update-sitemap
Pages with Sitemap Not Submitted
Severity Level: Warning
Category: Crawlability, Indexability
Summary
Your sitemap hasn’t been submitted to search engines.
Recommended Fix
Submit your sitemap to Google and Bing.
Who Should Fix
SEO Specialist
More Information
https://rankmath.com/kb/indexed-not-submitted-in-sitemap/
How to Fix
https://www.semrush.com/blog/submit-sitemap-to-google/
Pages with No XML Sitemap
Severity Level: Warning
Category: Crawlability, Indexability
Summary
Some sites don’t have an XML sitemap, which helps search engines discover your pages.
Recommended Fix
Create and submit an XML sitemap.
Who Should Fix
SEO Specialist, Developer
More Information
https://moz.com/learn/seo/xml-sitemaps
How to Fix
https://developers.google.com/search/docs/crawling-indexing/sitemaps/build-sitemap
Pages with No Sitemap in Robots.txt
Severity Level: Notice
Category: Crawlability, Indexability
Summary
Your robots.txt doesn’t reference your sitemap, which helps search engines find it.
Recommended Fix
Add a Sitemap directive to your robots.txt file.
Who Should Fix
Developer, SEO Specialist
More Information
https://seosly.com/blog/sitemap-xml-not-indicated-in-robots-txt/
How to Fix
https://rankmath.com/kb/add-sitemaps-to-robots-txt/
Pages with No Structured Data
Severity Level: Notice
Category: Technical SEO, Rich Results
Summary
Some pages lack structured data, which helps search engines understand your content.
Recommended Fix
Add relevant structured data (like Schema.org) to your pages.
Who Should Fix
SEO Specialist, Developer
More Information
https://developers.google.com/search/docs/appearance/structured-data/intro-structured-data
How to Fix
https://www.semrush.com/blog/schema-markup/
Pages with Invalid Structured Data
Severity Level: Warning
Category: Technical SEO, Rich Results
Summary
Some pages have structured data errors, which can prevent rich results.
Recommended Fix
Validate and fix structured data using Google’s Rich Results Test.
Who Should Fix
SEO Specialist, Developer
More Information
https://seotwix.com/blog/how-to-fix-structured-data-item-is-invalid/
How to Fix
https://www.evisio.co/knowledge/how-to-fix-invalid-structured-data-errors/
Pages with No Open Graph Tags
Severity Level: Notice
Category: Meta Tags, Social Sharing
Summary
Some pages lack Open Graph tags, which help control how your content appears on social media.
Recommended Fix
Add Open Graph tags to your pages.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://yoast.com/features/content-previews/social-previews/
How to Fix
Pages with No Twitter Card Tags
Severity Level: Notice
Category: Meta Tags, Social Sharing
Summary
Some pages lack Twitter Card tags, which help control how your content appears on Twitter.
Recommended Fix
Add Twitter Card tags to your pages.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://www.conductor.com/academy/twitter-cards/
How to Fix
https://wpexperts.io/blog/fix-twitter-and-facebook-open-graph-issue/
Pages with No Hreflang Tag
Severity Level: Notice
Category: Meta Tags, International SEO
Summary
Some pages don’t have hreflang tags, which help with international targeting.
Recommended Fix
Add hreflang tags for multilingual or multi-regional sites.
Who Should Fix
SEO Specialist, Developer
More Information
https://ahrefs.com/blog/hreflang-tags/
How to Fix
https://moz.com/learn/seo/hreflang-tag
Pages with Invalid Hreflang Tag
Severity Level: Warning
Category: Meta Tags, International SEO
Summary
Some hreflang tags are invalid or incorrectly formatted.
Recommended Fix
Fix or remove invalid hreflang tags.
Who Should Fix
SEO Specialist, Developer
More Information
https://ahrefs.com/blog/hreflang-tags/
How to Fix
https://moz.com/learn/seo/hreflang-tag
Pages with Missing X-Default Hreflang
Severity Level: Notice
Category: Meta Tags, International SEO
Summary
Some multilingual sites lack an x-default hreflang, which helps search engines serve the right page.
Recommended Fix
Add an x-default hreflang tag for the default language/version.
Who Should Fix
SEO Specialist, Developer
More Information
https://victorious.com/blog/what-is-x-default/
How to Fix
https://sitechecker.pro/site-audit-issues/x-default-hreflang-annotation-missing-empty/
Pages with HTTP/2 Not Enabled
Severity Level: Notice
Category: Site Performance, Technical SEO
Summary
Your server does not support HTTP/2, which can speed up page loading.
Recommended Fix
Enable HTTP/2 on your server.
Who Should Fix
Developer
More Information
https://www.searchenginejournal.com/what-is-http2/410586/
How to Fix
https://www.inmotionhosting.com/support/server/apache/enable-http-2-apache/
Pages with No Google Analytics
Severity Level: Notice
Category: Technical SEO, Analytics
Summary
Some pages don’t have Google Analytics tracking installed.
Recommended Fix
Add Google Analytics tracking code to your site.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.rankranger.com/seo-glossary/google-analytics-tracking-code
How to Fix
https://chartio.com/learn/marketing-analytics/how-to-add-google-analytics-tracking-to-a-website/
Pages with No Facebook Pixel
Severity Level: Notice
Category: Technical SEO, Analytics
Summary
Some pages don’t have Facebook Pixel tracking installed.
Recommended Fix
Add Facebook Pixel tracking code to your site.
Who Should Fix
Developer, Marketing
More Information
https://www.simplilearn.com/what-is-facebook-pixel-article
How to Fix
https://leadsbridge.com/blog/how-to-install-facebook-pixel/
Pages with No Conversion Tracking
Severity Level: Notice
Category: Technical SEO, Analytics
Summary
Some pages don’t have conversion tracking installed.
Recommended Fix
Add conversion tracking code (Google Ads, Facebook, etc.) to your site.
Who Should Fix
Developer, Marketing
More Information
https://www.simpletiger.com/resources/glossary/conversion-tracking
How to Fix
https://www.wordstream.com/blog/ws/2022/08/30/google-ads-conversion-tracking
Pages with No Call to Action
Severity Level: Notice
Category: On-Page SEO, User Experience
Summary
Some pages lack a clear call to action, which can hurt conversions.
Recommended Fix
Add a clear, visible call to action to each page.
Who Should Fix
Content Editor, Marketing
More Information
https://blog.hubspot.com/marketing/call-to-action-examples
How to Fix
https://wiredimpact.com/support/adding-call-to-action-content/
Pages with No Contact Information
Severity Level: Notice
Category: On-Page SEO, User Experience
Summary
Some pages don’t display contact information, which can reduce trust.
Recommended Fix
Add contact information to your site (footer, contact page, etc.).
Who Should Fix
Content Editor, Marketing
More Information
https://usual.ie/blog/why-clear-contact-information-is-important
How to Fix
https://www.elegantthemes.com/blog/wordpress/call-link-html-phone-number
Pages with No Privacy Policy
Severity Level: Notice
Category: On-Page SEO, Legal
Summary
Some pages don’t link to a privacy policy, which is required for compliance.
Recommended Fix
Add a privacy policy page and link to it from your site.
Who Should Fix
Content Editor, Legal
More Information
https://usercentrics.com/knowledge-hub/what-is-a-privacy-policy-and-why-do-you-need-one/
How to Fix
https://termly.io/resources/guides/how-to-write-a-privacy-policy/
Pages with No Terms of Service
Severity Level: Notice
Category: On-Page SEO, Legal
Summary
Some pages don’t link to terms of service, which is recommended for compliance.
Recommended Fix
Add a terms of service page and link to it from your site.
Who Should Fix
Content Editor, Legal
More Information
https://termly.io/resources/articles/terms-and-conditions/
How to Fix
https://www.termsfeed.com/blog/wordpress-terms-conditions-add/
Pages with No Cookie Policy
Severity Level: Notice
Category: On-Page SEO, Legal
Summary
Some pages don’t link to a cookie policy, which is required in some regions.
Recommended Fix
Add a cookie policy page and link to it from your site.
Who Should Fix
Content Editor, Legal
More Information
https://allaboutcookies.org/do-i-need-cookie-policy-website
How to Fix
https://termly.io/resources/guides/how-to-add-a-cookie-policy-to-your-website/
Pages with No About Page
Severity Level: Notice
Category: On-Page SEO, User Experience
Summary
Some sites don’t have an About page, which helps build trust.
Recommended Fix
Add an About page to your site.
Who Should Fix
Content Editor, Marketing
More Information
https://www.business.com/articles/importance-of-about-page-on-website/
How to Fix
https://www.orbitmedia.com/blog/about-page-best-practices-examples/
Pages with No Logo
Severity Level: Notice
Category: On-Page SEO, Branding
Summary
Some sites don’t display a logo, which helps with branding and recognition.
Recommended Fix
Add a logo to your site.
Who Should Fix
Content Editor, Designer
More Information
https://www.woorank.com/en/blog/logo-design-best-practices-for-seo-friendly-websites-in-2024
How to Fix
https://www.contexteditor.org/how-to-add-logo-in-html/
Pages with No Copyright Notice
Severity Level: Notice
Category: On-Page SEO, Legal
Summary
Some sites don’t display a copyright notice, which helps protect your content.
Recommended Fix
Add a copyright notice to your site footer.
Who Should Fix
Content Editor, Legal
More Information
How to Fix
https://blog.hubspot.com/website/copyright-notice
Pages with No Social Links
Severity Level: Notice
Category: On-Page SEO, User Experience
Summary
Some sites don’t link to social media profiles, which can help build credibility.
Recommended Fix
Add links to your social media profiles.
Who Should Fix
Content Editor, Marketing
More Information
https://erieit.edu/everything-you-need-to-know-about-integrating-social-media-with-your-website/
How to Fix
https://elfsight.com/blog/how-to-add-social-media-icons-on-any-website-for-free/
Broken External Images
Severity Level: Warning
Category: External Linking, User Experience
Summary
Some images from external sources are broken, hurting user experience.
Recommended Fix
Update or remove broken external image links.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://www.evisio.co/knowledge/how-to-fix-broken-external-images/
How to Fix
https://www.meredithshusband.com/blog/external-images-broken
Broken External JavaScript
Severity Level: Warning
Category: External Linking, Site Performance
Summary
Some JavaScript files from external sources are broken, which can break site features.
Recommended Fix
Update or remove broken external JavaScript links.
Who Should Fix
Developer
More Information
https://help.ahrefs.com/en/articles/2750495-javascript-broken-error-in-site-audit
How to Fix
https://www.evisio.co/knowledge/how-to-fix-broken-external-javascript-and-css-files/
Broken External CSS
Severity Level: Warning
Category: External Linking, Site Performance
Summary
Some CSS files from external sources are broken, which can break site styling.
Recommended Fix
Update or remove broken external CSS links.
Who Should Fix
Developer
More Information
https://www.antino.com/blog/importance-css-web-development
How to Fix
https://www.evisio.co/knowledge/how-to-fix-broken-external-javascript-and-css-files/
Pages with Broken Internal Images
Severity Level: Warning
Category: Internal Linking, User Experience
Summary
Some images hosted on your site are broken, hurting user experience.
Recommended Fix
Update or remove broken internal image links.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://climbconquer.com/seo/technical-seo/broken-images/
How to Fix
https://seotwix.com/blog/how-to-fix-internal-images-are-broken/
Pages with Broken Internal JavaScript
Severity Level: Warning
Category: Internal Linking, Site Performance
Summary
Some JavaScript files hosted on your site are broken, which can break features.
Recommended Fix
Update or remove broken internal JavaScript links.
Who Should Fix
Developer
More Information
https://risify.app/broken-internal-javascript-and-css-files
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-broken-internal-javascript-and-css-files/
Pages with Broken Internal CSS
Severity Level: Warning
Category: Internal Linking, Site Performance
Summary
Some CSS files hosted on your site are broken, which can break styling.
Recommended Fix
Update or remove broken internal CSS links.
Who Should Fix
Developer
More Information
https://www.antino.com/blog/importance-css-web-development
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-broken-internal-javascript-and-css-files/
Pages with Multiple Meta Robots Tags
Severity Level: Warning
Category: Meta Tags, Indexability
Summary
Some pages have more than one meta robots tag, which can confuse search engines.
Recommended Fix
Use only one meta robots tag per page.
Who Should Fix
SEO Specialist, Developer
More Information
https://usergrowth.io/academy/meta-robots-tag/
How to Fix
https://rankmath.com/kb/fix-duplicate-meta-tags/
Pages with Conflicting Meta Robots Tags
Severity Level: Warning
Category: Meta Tags, Indexability
Summary
Some pages have conflicting meta robots tags, which can confuse search engines.
Recommended Fix
Ensure meta robots tags are consistent and correct.
Who Should Fix
SEO Specialist, Developer
More Information
https://www.conductor.com/academy/meta-robots-tag/
How to Fix
https://usergrowth.io/academy/meta-robots-tag/
Pages with X-Robots-Tag HTTP Header
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use the X-Robots-Tag HTTP header for indexing control.
Recommended Fix
Ensure X-Robots-Tag headers are used correctly and not conflicting with meta tags.
Who Should Fix
SEO Specialist, Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Robots-Tag
How to Fix
https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag
Pages with Nofollow Tag
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use a nofollow tag, which tells search engines not to follow links on the page.
Recommended Fix
Use nofollow tags only where appropriate.
Who Should Fix
SEO Specialist, Developer
More Information
https://www.liquidweb.com/wordpress/seo/what-is-nofollow-link/
How to Fix
Pages with No Archive Tag
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use a noarchive tag, which prevents search engines from storing a cached copy.
Recommended Fix
Use noarchive tags only where necessary.
Who Should Fix
SEO Specialist, Developer
More Information
https://sitechecker.pro/what-is-robots-noarchive-tag/
How to Fix
Pages with No Snippet Tag
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use a nosnippet tag, which prevents search engines from showing a description in results.
Recommended Fix
Use nosnippet tags only where necessary.
Who Should Fix
SEO Specialist, Developer
More Information
https://rankmath.com/seo-glossary/no-snippet/
How to Fix
https://www.screamingfrog.co.uk/seo-spider/issues/directives/nosnippet/
Pages with No ODP Tag
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use a noodp tag, which prevents use of the Open Directory Project description.
Recommended Fix
Use noodp tags only if you don’t want ODP descriptions.
Who Should Fix
SEO Specialist, Developer
More Information
https://searchfacts.com/noodp-noydir-meta-tags/
How to Fix
https://www.screamingfrog.co.uk/seo-spider/issues/directives/noodp/
Pages with No YDIR Tag
Severity Level: Notice
Category: Meta Tags, Indexability
Summary
Some pages use a noydir tag, which prevents use of the Yahoo Directory description.
Recommended Fix
Use noydir tags only if you don’t want Yahoo Directory descriptions.
Who Should Fix
SEO Specialist, Developer
More Information
https://searchfacts.com/noodp-noydir-meta-tags/
How to Fix
https://www.screamingfrog.co.uk/seo-spider/issues/directives/noydir/
Pages with No Cache-Control Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack cache-control headers, which help browsers cache content efficiently.
Recommended Fix
Add appropriate cache-control headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.debugbear.com/docs/http-cache-control-header
How to Fix
https://blog.sucuri.net/2024/07/how-to-set-cache-control-headers.html
Pages with No Expires Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack expires headers, which help browsers cache content efficiently.
Recommended Fix
Add expires headers to your server configuration.
Who Should Fix
Developer
More Information
https://wolf-of-seo.de/en/what-is/expires-header/
How to Fix
https://www.bluehost.com/blog/add-expires-headers-wordpress/
Pages with No ETag Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack ETag headers, which help browsers cache content efficiently.
Recommended Fix
Add ETag headers to your server configuration.
Who Should Fix
Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag
How to Fix
https://www.keycdn.com/support/configure-entity-tags-etags
Pages with No Last-Modified Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack Last-Modified headers, which help browsers cache content efficiently.
Recommended Fix
Add Last-Modified headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.clarify.ai/blog/understanding-the-importance-of-the-last-modified-http-header
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified
Pages with No Vary Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack Vary headers, which help with caching and content negotiation.
Recommended Fix
Add Vary headers to your server configuration.
Who Should Fix
Developer
More Information
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Vary
Pages with No Content-Encoding Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack Content-Encoding headers, which help browsers decompress content.
Recommended Fix
Enable compression and add Content-Encoding headers.
Who Should Fix
Developer
More Information
How to Fix
https://www.hostinger.com/tutorials/enable-gzip-compression
Pages with No Transfer-Encoding Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack Transfer-Encoding headers, which help browsers handle chunked transfers.
Recommended Fix
Enable chunked transfer encoding if needed.
Who Should Fix
Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Transfer-Encoding
How to Fix
https://modheader.com/usecases/headers/transfer-encoding
Pages with No Accept-Ranges Header
Severity Level: Notice
Category: Technical SEO, Site Performance
Summary
Some pages lack Accept-Ranges headers, which help browsers download files efficiently.
Recommended Fix
Add Accept-Ranges headers to your server configuration.
Who Should Fix
Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Ranges
How to Fix
https://modheader.com/usecases/headers/accept-ranges
Pages with No X-Frame-Options Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack X-Frame-Options headers, which help prevent clickjacking.
Recommended Fix
Add X-Frame-Options headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.geeksforgeeks.org/http-headers-x-frame-options/
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
Pages with No X-XSS-Protection Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack X-XSS-Protection headers, which help prevent cross-site scripting.
Recommended Fix
Add X-XSS-Protection headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.sleepinggiantmedia.co.uk/blog/http-security-headers-the-ultimate-seo-guide
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
Pages with No X-Content-Type-Options Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack X-Content-Type-Options headers, which help prevent MIME type sniffing.
Recommended Fix
Add X-Content-Type-Options headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.keycdn.com/support/x-content-type-options
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
Pages with No Referrer-Policy Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack Referrer-Policy headers, which help control referrer information.
Recommended Fix
Add Referrer-Policy headers to your server configuration.
Who Should Fix
Developer
More Information
https://htaccessbook.com/important-security-headers/
How to Fix
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
Pages with No Feature-Policy Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack Feature-Policy headers, which help control browser features.
Recommended Fix
Add Feature-Policy headers to your server configuration.
Who Should Fix
Developer
More Information
https://www.validbot.com/header/Feature-Policy.html
How to Fix
https://protocolguard.com/resources/feature-policy/
Pages with No Permissions-Policy Header
Severity Level: Notice
Category: Security, Technical SEO
Summary
Some pages lack Permissions-Policy headers, which help control browser features.
Recommended Fix
Add Permissions-Policy headers to your server configuration.
Who Should Fix
Developer
More Information
https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Permissions_Policy
How to Fix
https://www.nitinfotech.com/how-to-configure-permissions-policy-header/
Pages with Broken Video Embeds
Severity Level: Warning
Category: Media, User Experience
Summary
Some video embeds are broken or unavailable, hurting user experience.
Recommended Fix
Update or remove broken video embeds.
Who Should Fix
Content Editor, SEO Specialist
More Information
https://neilpatel.com/blog/embed-videos/
How to Fix
https://support.wistia.com/en/articles/8234015-keeping-your-embeds-up-to-date
Pages with Blocked JavaScript Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some JavaScript files are blocked from crawling, which can affect how search engines see your site.
Recommended Fix
Allow search engines to crawl important JavaScript files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked CSS Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some CSS files are blocked from crawling, which can affect how search engines see your site.
Recommended Fix
Allow search engines to crawl important CSS files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked Images
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some images are blocked from crawling, which can affect how search engines see your site.
Recommended Fix
Allow search engines to crawl important images in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://yoast.com/ultimate-guide-robots-txt/
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked CSS Resources
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some CSS resources are blocked from crawling, which can affect how search engines see your site.
Recommended Fix
Allow search engines to crawl important CSS resources in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked JS Resources
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some JavaScript resources are blocked from crawling, which can affect how search engines see your site.
Recommended Fix
Allow search engines to crawl important JS resources in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked Font Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some font files are blocked from crawling, which can affect how your site is displayed.
Recommended Fix
Allow search engines to crawl important font files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://seodepths.com/seo-research/web-fonts-impact-server-response-time/
How to Fix
https://seotwix.com/blog/how-to-fix-issues-with-blocked-internal-resources-in-robots-txt/
Pages with Blocked Video Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some video files are blocked from crawling, which can affect how your site is displayed.
Recommended Fix
Allow search engines to crawl important video files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.searchenginejournal.com/common-robots-txt-issues/437484/
How to Fix
Pages with Blocked PDF Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some PDF files are blocked from crawling, which can affect search visibility.
Recommended Fix
Allow search engines to crawl important PDF files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://hikeseo.co/learn/onsite/technical/robots-txt/
How to Fix
https://hikeseo.co/learn/onsite/technical/robots-txt/
Pages with Blocked Audio Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some audio files are blocked from crawling, which can affect user experience.
Recommended Fix
Allow search engines to crawl important audio files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://hikeseo.co/learn/onsite/technical/robots-txt/
How to Fix
https://hikeseo.co/learn/onsite/technical/robots-txt/
Pages with Blocked SVG Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some SVG files are blocked from crawling, which can affect how your site is displayed.
Recommended Fix
Allow search engines to crawl important SVG files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://hikeseo.co/learn/onsite/technical/robots-txt/
How to Fix
https://hikeseo.co/learn/onsite/technical/robots-txt/
Pages with Blocked Iframe Content
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some iframe content is blocked from crawling, which can affect how your site is displayed.
Recommended Fix
Allow search engines to crawl important iframe content in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://www.searchenginejournal.com/google-iframes-debunking-myths-understanding-seo-impact/484037/
How to Fix
https://www.noibu.com/blog/causes-impact-and-solutions-of-html-iframe-security-error
Pages with Blocked JSON Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some JSON files are blocked from crawling, which can affect structured data.
Recommended Fix
Allow search engines to crawl important JSON files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://hikeseo.co/learn/onsite/technical/robots-txt/
How to Fix
https://hikeseo.co/learn/onsite/technical/robots-txt/
Pages with Blocked XML Files
Severity Level: Warning
Category: Crawlability, Technical SEO
Summary
Some XML files are blocked from crawling, which can affect sitemaps and feeds.
Recommended Fix
Allow search engines to crawl important XML files in robots.txt.
Who Should Fix
Developer, SEO Specialist
More Information
https://hikeseo.co/learn/onsite/technical/robots-txt/
How to Fix
https://hikeseo.co/learn/onsite/technical/robots-txt/
AMP Page Missing Canonical Tag
Severity Level: Warning
Category: AMP, Technical SEO
Summary
Some AMP pages are missing a canonical tag, which can cause duplicate content issues and indexing problems.
Recommended Fix
Add a canonical tag to each AMP page pointing to the corresponding non-AMP version.
Who Should Fix
Developer, SEO Specialist
More Information
https://sitechecker.pro/site-audit-issues/amp-page-url-missing-canonical-tag/
How to Fix
https://seotwix.com/blog/how-to-fix-amp-pages-have-no-canonical-tag/
AMP Page Uses Disallowed HTML Tag
Severity Level: Error
Category: AMP, Technical SEO
Summary
Some AMP pages use HTML tags that are not allowed in AMP, which can cause the page to be invalid.
Recommended Fix
Remove or replace disallowed HTML tags with AMP-compliant alternatives.
Who Should Fix
Developer
More Information
https://sitechecker.pro/site-audit-issues/amp-page-validation-errors/
How to Fix
https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/
AMP Page Missing Required Script
Severity Level: Error
Category: AMP, Technical SEO
Summary
Some AMP pages are missing the required AMP JavaScript library, making them invalid for AMP.
Recommended Fix
Add the required AMP JS library to the <head> of each AMP page.
Who Should Fix
Developer
More Information
https://sitechecker.pro/site-audit-issues/amp-page-validation-errors/
How to Fix
https://amp.dev/documentation/guides-and-tutorials/start/converting/resolving-errors
AMP Page Missing Required Meta Charset
Severity Level: Error
Category: AMP, Technical SEO
Summary
Some AMP pages are missing the required <meta charset="utf-8"> tag, making them invalid for AMP.
Recommended Fix
Add <meta charset="utf-8"> as the first child of the <head> tag on all AMP pages.
Who Should Fix
Developer
More Information
https://www.screamingfrog.co.uk/seo-spider/issues/amp/missing-invalid-meta-charset-tag/
How to Fix
https://amp.dev/documentation/guides-and-tutorials/start/converting/resolving-errors
AMP Page Missing Viewport Meta Tag
Severity Level: Error
Category: AMP, Technical SEO
Summary
Some AMP pages are missing the required viewport meta tag, which is needed for proper mobile display.
Recommended Fix
Add <meta name="viewport" content="width=device-width,minimum-scale=1"> to the <head> of all AMP pages.
Who Should Fix
Developer
More Information
https://www.screamingfrog.co.uk/seo-spider/issues/amp/missing-invalid-meta-viewport-tag/
How to Fix
AMP Page Uses Disallowed Inline Style Severity Level: Error Category: AMP, Technical SEO Some AMP pages use inline styles, which are not allowed in AMP HTML. Move all styles to a single Developer https://sitechecker.pro/site-audit-issues/amp-page-validation-errors// https://amp.dev/documentation/guides-and-tutorials/start/converting/resolving-errors Severity Level: Error Category: AMP, Technical SEO Some AMP pages use custom JavaScript, which is not allowed in AMP HTML. Remove all custom JavaScript from AMP pages. Use only AMP components and scripts. Developer https://amp.dev/documentation/guides-and-tutorials/develop/custom-javascript https://amp.dev/documentation/guides-and-tutorials/start/converting/resolving-errors Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 410 Gone status, indicating they are permanently removed from the server. Remove internal links to deleted pages or restore the content if removal was accidental. Developer, SEO Specialist https://wetopi.com/error-code-410-gone/ https://netpeak.net/blog/all-about-using-the-410-gone-error/ Severity Level: Notice Category: Crawlability, Technical SEO Some pages return a 451 status, indicating they are unavailable for legal reasons (e.g., copyright or privacy law). Ensure legal removals are intentional and properly documented. Legal, Developer https://sitechecker.pro/what-is-451-status-code/ https://rankmath.com/seo-glossary/451-unavailable-for-legal-reasons/ Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 429 Too Many Requests status, which means your site is rate-limiting crawlers or users. Adjust server settings or crawl rate to avoid rate limiting. Developer, SEO Specialist https://blog.sucuri.net/2024/05/what-is-http-error-429-too-many-requests.html https://sitechecker.pro/what-is-429-status-code/ Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 500 Internal Server Error status, indicating a server-side problem. Check server logs and configuration to resolve the error. Developer https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/500 https://kinsta.com/blog/500-internal-server-error/ Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 502 Bad Gateway status, indicating a problem with a server acting as a gateway or proxy. Check server and proxy configurations to resolve the error. Developer https://www.okta.com/identity-101/bad-gateway/ https://kinsta.com/blog/502-bad-gateway/ Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 503 Service Unavailable status, indicating the server is temporarily unable to handle the request. Minimize downtime and use proper Retry-After headers if the outage is planned. Developer https://blog.sucuri.net/2022/10/what-is-the-503-service-unavailable-error-how-to-fix-it.html https://www.hostinger.com/tutorials/503-service-unavailable Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 410 Gone status, indicating they are permanently removed from the server. Remove internal links to deleted pages or restore the content if removal was accidental. Developer, SEO Specialist https://netpeak.net/blog/all-about-using-the-410-gone-error/ https://www.evendigit.com/best-practices-410-status-code/ Severity Level: Warning Category: Crawlability, Internal Linking Some links have invalid URL syntax, such as missing protocols, backslashes, or unnecessary characters, which can break navigation and crawling. Ensure all URLs use the correct format and do not contain typos or extra characters. Developer, Content Editor https://error404.atomseo.com/blog/invalid-url https://www.evisio.co/knowledge/how-to-fix-malformed-link-issues/ Severity Level: Warning Category: Mobile Optimization, Technical SEO Some pages use a viewport meta tag that is missing the width or initial scale value, which can cause display issues on mobile devices. Add Developer https://developer.chrome.com/docs/lighthouse/best-practices/viewport https://sitechecker.pro/site-audit-issues/viewport-tag-initial-scale-incorrect/ Severity Level: Notice Category: Crawlability, Technical SEO Some pages return a 418 status (a humorous code indicating the server refuses to brew coffee because it is a teapot). Rare but possible on misconfigured servers. Remove or replace non-standard 418 codes unless intentionally used for debugging. Developer https://www.resultfirst.com/blog/http-status-code/418-status-code/ https://www.resultfirst.com/blog/http-status-code/418-status-code/ Severity Level: Notice Category: Crawlability, Technical SEO Some pages return a 499 status (client closed the connection before the server responded). Common with aggressive bot protection or server timeouts. Optimize server response times and adjust bot-blocking rules. Developer https://error404.atomseo.com/blog/status-code-499 https://wetopi.com/error-code-499-client-closed-request/ Severity Level: Warning Category: Crawlability, Technical SEO Some pages return a 504 status (a gateway or proxy server timed out while waiting for a response). Check upstream servers, load balancers, or CDN configurations for bottlenecks. Developer https://www.bluehost.com/blog/what-is-a-504-gateway-timeout/ https://kinsta.com/blog/504-gateway-timeout/ Severity Level: Notice Category: Security, Technical SEO Some pages lack a Content-Security-Policy header, which helps prevent cross-site scripting (XSS) attacks. Add a Content-Security-Policy header to your server configuration. Developer https://web.dev/articles/strict-csp https://blog.sucuri.net/2023/04/how-to-set-up-a-content-security-policy-csp-in-3-steps.html Severity Level: Notice Category: Security, Technical SEO Some pages lack a Cross-Origin-Embedder-Policy header, which helps prevent cross-origin attacks. Add a Cross-Origin-Embedder-Policy header to your server configuration. Developer https://protocolguard.com/resources/cross-origin-embedder-policy/Summary
Recommended Fix
<style amp-custom> tag in the <head> and remove all inline styles.Who Should Fix
More Information
How to Fix
AMP Page Uses Prohibited JavaScript
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 410 Gone Error
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 451 Unavailable For Legal Reasons
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 429 Too Many Requests
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 500 Internal Server Error
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 502 Bad Gateway
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 503 Service Unavailable
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 410 Gone Error
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
Invalid URL Syntax or Malformed Links
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
Viewport Meta Tag Missing Width or Initial Scale
Summary
Recommended Fix
width=device-width and initial-scale=1 to the viewport meta tag.Who Should Fix
More Information
How to Fix
HTTP 418 I’m a Teapot
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 499 Client Closed Request (edge case)
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
HTTP 504 Gateway Timeout
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
Missing Content-Security-Policy Header (edge case)
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix
Missing Cross-Origin-Embedder-Policy Header (edge case)
Summary
Recommended Fix
Who Should Fix
More Information
How to Fix