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HTML Structure Checker

Paste raw HTML to audit its heading hierarchy, image alt text, links, structured data, and duplicate ids — all client-side.

This is a document-structure auditor, not a scorer — it complements the SEO Optimizer rather than repeating it. Paste any page's HTML source and it builds a full H1–H6 outline tree so you can spot skipped heading levels or multiple H1s at a glance, lists every image with its alt text (or flags it as missing or low-quality), counts internal versus external links and flags vague anchor text like "click here", breaks down every JSON-LD block by its @type, and catches duplicate id attributes that can silently break anchor links and accessibility. Useful for developers and content editors checking a template before it ships, or diagnosing why a page reads oddly to screen readers or crawlers.

How to Use HTML SEO Checker

  1. Paste the full HTML source of a page into the input box.
  2. Click Analyze.
  3. Review the heading outline tree for skipped levels or multiple H1s.
  4. Check the image alt-text audit table for missing or weak alt text.
  5. Review the link audit and JSON-LD type breakdown for gaps.

Frequently Asked Questions

SEO Optimizer scores an overall page (title, meta, OG tags, speed hints) and can fetch a live URL. HTML SEO Checker is paste-only and focused purely on document structure — it shows the full H1-H6 heading tree, an alt-text audit table for every image, a link audit, every JSON-LD @type found, and duplicate HTML ids.

Paste your page's HTML and click Analyze. The Heading Outline panel shows every H1-H6 in document order as a nested tree, flagging skipped levels and multiple or missing H1 tags.

Yes. The Image Audit table lists every <img> with its alt text (or a missing/low-quality flag), so you can see accessibility and SEO gaps at a glance.