Free Technical SEO Audit Tool — Check Any Page's HTML in Seconds
Paste a page's HTML and this technical SEO audit tool checks its title, meta description, headings, canonical, robots meta tag, hreflang, structured data, images and links. Each finding says what was found and why it matters. No signup, nothing leaves your browser.
Paste HTML to audit it.
What the Audit Checks
- Title and meta description. Present, not duplicated within the page, and a length you can read at a glance. Google can rewrite either, so treat length as a guide.
- Headings. The first H1, the count of H1 elements and any skipped heading levels.
- Canonical and robots. A single canonical, whether it is absolute and whether it matches the URL you enter, plus noindex or nofollow in a robots meta tag.
- Language and hreflang. The html lang value, and each hreflang annotation with a self-reference check when you give the URL.
- Social tags. Open Graph and Twitter card tags used when the page is shared.
- Structured data. Each JSON-LD block is parsed, and its types are listed. Broken JSON is flagged.
- Images and links. Missing alt attributes, missing dimensions, empty anchors and nofollow counts.
What a Single-Page HTML Audit Cannot See
The audit reads only the HTML you paste. It cannot see HTTP status codes or headers such as X-Robots-Tag, how the page renders after JavaScript runs, page speed, redirects, whether the URL is indexed, or how other pages link to it. Use it as a fast first pass on a template or a single URL, then confirm with Search Console's URL Inspection and a crawler for the whole site. If your content is built in the browser, copy the rendered HTML from the element inspector, not the page source.
Technical SEO Audit Tool FAQs
Does the tool fetch my page for me?
No. You paste the HTML. Browsers block most cross-site requests to other people's pages, and pasting keeps your data off every server, including ours.
Is there a perfect title or meta description length?
No. Google does not set a fixed length and may rewrite both. The tool flags very short and very long values because they are more likely to be cut off or to say too little.
Should a page have only one H1?
One clear H1 is the usual pattern, but HTML allows more than one and Google handles them. The tool reports the count so you can decide whether it is intentional.
Why does it ask for the page URL?
With the URL, the tool can check that the canonical points to the same page and that an hreflang set includes the page itself, which are common technical faults.
Does this tool store or send my data anywhere?
No. The HTML is parsed in your browser with JavaScript. Nothing is uploaded, logged or stored on any server, including ours.
Want the whole site audited?
Contomatix runs full technical audits and turns the findings into a prioritised plan.