Free SEO Tool

Technical SEO Checker

Paste your page HTML and get a 10-point audit of the technical and structural signals that affect crawlability, indexability, and AI citation. No URL needed.

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Paste your page HTML and click Analyse Page

What Is This Tool?

What Is Technical SEO?

Technical SEO is the layer of optimisation that happens in your page HTML rather than in your content. It covers whether your page can be crawled and indexed, whether search engines and AI engines can identify the key metadata, and whether the structural markup gives crawlers the context they need to categorise the page correctly.

This tool audits 10 technical and structural signals directly from your page HTML. It is separate from content quality. The Answer Engine Readiness Checker analyses what you have written, while this tool analyses the HTML that wraps it.

  • A single noindex meta tag prevents both Google and AI engines from indexing your page entirely
  • Canonical tags tell crawlers which URL is the definitive version. Missing canonicals cause duplicate content issues
  • Pages with JSON-LD schema markup are cited in AI answers significantly more often than pages without it
  • GPTBot (OpenAI) and OAI-SearchBot are blocked by wildcard noindex directives just like Googlebot
  • Missing author markup and publication dates reduce trust scores used by both Google and AI engines

How to Use

How to Use the Technical SEO Checker

  1. 1
    Get Your Page HTML

    Open the page in your browser. Right-click anywhere and choose "View Page Source". Select all (Ctrl+A) and copy (Ctrl+C).

  2. 2
    Paste and Run the Audit

    Paste the full HTML and click Analyse Page. The tool checks 4 critical signals and 6 structural signals, each with a pass or fail result.

  3. 3
    Fix Critical Issues First

    Address any failed critical signals first: noindex, GPTBot access, schema, canonical. These block indexing entirely. Then work through the structural signals.

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What the 10 Checks Cover

Critical signals: crawlability and indexability

The four critical signals are checked before any content is read. A noindex directive tells all crawlers to skip the page. A missing canonical leaves the indexing decision ambiguous. No JSON-LD schema means AI engines have to guess your content type rather than read it directly. A GPTBot block means OpenAI cannot crawl or train on your content. Any one of these failing is a hard barrier. Fix critical issues before anything else.

Structural signals: what crawlers read after they get in

Once a page passes the critical checks, crawlers parse the structure. Title tag and meta description define how the page appears in search results and AI summaries. The H1 is the primary topic signal. Open Graph tags provide context for social sharing and AI parsing when schema is absent. Author markup and publication dates are trust signals used by both Google quality systems and AI citation engines.

Technical SEO vs content SEO: use both tools together

A page can have perfect technical SEO and still rank poorly if the content is thin or vague. Equally, excellent content is invisible if the page is noindexed or has no schema. The Technical SEO Checker audits the HTML. The Answer Engine Readiness Checker audits the content text. Run both for a complete picture of why a page is or is not performing.

FAQs

Technical SEO Checker FAQs

How is this different from the Answer Engine Readiness Checker?
The Answer Engine Readiness Checker takes plain text and analyses content quality: how well-structured, factual, and directly-answering your writing is. This tool takes page HTML and checks the technical markup: meta tags, schema, canonical, crawl access. Different inputs, different problems.
Why do I need to paste HTML rather than enter a URL?
Running a URL-based audit requires a server-side request to fetch the page, which needs an API. Pasting HTML keeps the tool free, instant, and private. Nothing is sent anywhere.
What is a canonical tag and why does it matter?
A canonical tag tells search engines which URL is the definitive version of a page. Without it, if your page is accessible at multiple URLs (with and without trailing slash, www vs non-www, etc.), crawlers may split authority across versions or choose the wrong one to index.
Will this catch all technical SEO issues?
No. This tool checks 10 high-impact signals from your HTML. It does not cover page speed, Core Web Vitals, structured data validation, internal linking, or server-level issues like redirect chains. Use it as a first-pass check, not a full audit.
Which schema type should I add if I have none?
For blog posts: Article schema. For pages with Q&A sections: FAQPage. For step-by-step guides: HowTo. Article is the most universally applicable. It covers author, date, and headline in one block.

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