SEO audit: free technical health check for any website
A free SEO audit for any website. Enter your URL and we'll check the technical SEO basics that affect how search engines and AI crawlers understand your site - meta tags, heading structure, structured data, canonical URLs, image alt text, and more.
Each issue is graded by severity with a clear explanation of the SEO impact. Critical issues block indexing or cause ranking penalties. Warnings suggest configuration changes that improve visibility. Info items are best-practice recommendations. The result is a prioritised fix list, not a wall of jargon.
Unlike most free audit tools, we run the analysis against both the raw HTML response and the JavaScript-rendered output, so we catch issues that exist only after JavaScript executes - the kind of issue that other tools miss on modern React, Vue, and Angular sites.
How to use this tool
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Enter any URL in the audit field above
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Click 'Audit page' to start the analysis
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We fetch and analyse the page in seconds - no signup needed
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Review the audit results grouped by category (meta tags, content, structure, accessibility)
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Check the severity of each issue (critical, warning, info) and read the impact explanation
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Fix critical issues first, then work through warnings to improve your overall SEO score
How it works
This audit runs a complete technical SEO analysis of your page. We parse the response for the elements that affect search engine and AI crawler understanding: title tag, meta description, canonical URL, Open Graph tags, Twitter Card tags, heading hierarchy (H1-H6), image alt text, structured data (JSON-LD, microdata), hreflang tags, and robots directives.
Each issue is scored by severity. Critical issues directly prevent indexing or cause ranking penalties (missing title, blocked by robots, duplicate canonicals). Warnings indicate suboptimal configuration that reduces visibility (missing meta description, no structured data, images without alt text). Info items are best-practice recommendations.
We also run a second pass that most free audit tools skip - we render your page in a headless browser and compare the rendered output against the raw HTML response. This catches the rendering gap: content that exists only after JavaScript executes, which non-rendering crawlers like GPTBot, ClaudeBot, and most social platforms never see. For modern React, Vue, and Angular sites, this gap is often the difference between strong rankings and silent invisibility.
The overall audit score reflects how well your page performs across all these checks. The results are anonymous, free, and require no signup - submit your URL and you'll have a prioritised fix list within seconds.
Why this matters for your site
Technical SEO is the foundation everything else sits on. It ensures search engines can discover, crawl, render, and index your pages - and that AI crawlers like GPTBot and ClaudeBot can understand them well enough to cite you in answer results. Even high-quality content fails to rank if the technical layer is broken.
The most common technical issues across any kind of website are: missing or duplicate title tags and meta descriptions, broken or duplicated canonical URLs, missing structured data, images without alt text, broken internal links, and slow page-load times. Each of these affects how search engines rank or display your content - and most are quick wins once you know they exist.
Modern JavaScript-heavy sites face an additional challenge: search engines and AI crawlers may not execute your JavaScript at all, or do so on a delayed schedule. Anything that depends on JavaScript to render - text content, meta tags, canonical URLs, structured data - may be invisible to crawlers during the initial pass. This audit catches both classes of issue: traditional SEO gaps AND JavaScript-rendering gaps.
Frequently asked questions
How do I improve my website's SEO score?▾
Start with the critical issues from your audit - missing title, missing meta description, broken canonical, missing structured data. These directly affect indexing and ranking. Then move to warnings: alt text, image optimisation, internal linking, mobile-friendliness. Most sites can lift their score significantly in a few hours of focused work.
What are the most important technical SEO factors?▾
Title tag and meta description are still the most directly visible to searchers. Canonical URLs prevent duplicate-content penalties. Structured data (JSON-LD) helps both search engines and AI crawlers understand your content. Heading hierarchy (one H1 per page, logical H2/H3 structure) gives semantic context. Image alt text supports both accessibility and image search. Mobile-friendliness affects rankings since Google's mobile-first index.
How often should I run an SEO audit?▾
Run an audit after any significant content or code change. For active sites, monthly audits catch new issues before they impact rankings. For static or low-change sites, quarterly is usually enough. Always audit after a framework upgrade, redesign, or migration - those are when subtle technical regressions tend to slip in.
Does this audit cover AI search engines and chatbots?▾
Yes. We check the same content that GPTBot, ClaudeBot, PerplexityBot, and similar AI crawlers see. Most AI crawlers do not execute JavaScript - they read raw HTML only - so JavaScript-rendered content is invisible to them. The audit flags this gap so you can fix it for both traditional and AI search.
How is this audit different from other free SEO tools?▾
Most free SEO checkers only analyse the JavaScript-rendered version of your page - what users see in a browser. We also analyse the raw HTML response, the version search engines and AI crawlers receive. The difference between these two versions often reveals issues no other free tool catches. The audit is also fully anonymous - no signup, no card, no account needed.
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Try it freeWant help fixing the issues we found?
PageGlass renders JavaScript-heavy pages so search engines and AI crawlers can actually see your content. Most issues this audit flags - empty body, JS-only canonical, invisible structured data - resolve automatically with prerendering. Free 7-day trial, no card needed.