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Heading Checker for Pasted HTML

Check your page's H1-H6 heading hierarchy for SEO and accessibility issues like missing H1s or skipped levels.

Runs entirely in your browser — your files are never uploaded to a server.

Last updated

This tool processes your input entirely in your browser. Nothing is sent to our servers.

How It Works

1. Choose Your File

Drag & drop or select the file you want to work with.

2. Processed in Your Browser

Everything happens locally on your device — your file is never uploaded anywhere.

3. Download Your Result

Get your finished file instantly, ready to save or share.

About Heading Checker for Pasted HTML

Checks a page’s heading structure (H1 through H6) for issues like multiple H1 tags, skipped heading levels, or an entirely missing H1 — structural problems that affect both SEO and accessibility.

Heading structure matters for two different audiences simultaneously: it helps search engines understand a page’s content hierarchy, and it helps screen reader users navigate efficiently, since screen readers let users jump directly between headings.

A page with a messy or skipped heading structure — an H1 followed directly by an H4, for instance — makes both of those jobs measurably harder, even though the page might look fine visually.

Frequently Asked Questions

How do I check the heading structure of a web page?

Open the page, press Ctrl+U (or Cmd+Option+U on Mac) to view the source, copy the HTML and paste it into the box above. Click Check Heading Structure to see an indented tree of every H1 to H6 plus any issues found.

What heading problems does the checker flag?

It reports a missing H1, multiple H1 tags, heading levels that skip, such as H2 straight to H4, and empty headings. It also lists all headings in an indented tree. It does not judge whether your heading wording is good or keyword-focused.

Can the heading checker test a live URL?

No. It reads only the HTML you paste and never fetches a page. If your headings are added by JavaScript, copy the rendered HTML instead: right-click the page, choose Inspect, then copy the outer HTML of the html element.

Is it wrong to have more than one H1?

The tool flags it because one H1 per page is the common best practice for clear structure. Multiple H1 tags are valid HTML, though, and not a rule that search engines penalize. Treat the warning as advice rather than an error.

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