HTML Heading Checker

Inspect h1-h6 heading structure and SEO hierarchy

100% free. This tool needs our server to do the work, so what you submit is sent there, processed and then discarded - it is never stored.

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About this tool

Proper heading structure (a single H1, followed by logically nested H2s, H3s, etc.) helps both search engines and screen reader users understand a page's content hierarchy. This tool inspects a page's H1-H6 headings and flags structural issues, like a missing H1 or skipped heading levels.

How to use this tool

  1. Scan page HTMLAnalyze heading tags from H1 through H6 in source order.
  2. Review heading mapCheck hierarchy and sequence across sections of the page.
  3. Identify structure issuesFind missing H1, duplicate primaries, or skipped heading levels.
  4. Fix template/content blocksUpdate markup and rerun checker until structure is clean.

Key features

  • Improves content hierarchy clarity for SEO and accessibility.
  • Highlights heading misuse that hurts readability and navigation.
  • Fast audit for CMS templates and content teams.
  • Supports cleaner screen-reader navigation experience.

Common uses

  • Auditing blog/article templates for semantic consistency.
  • Fixing heading issues reported in accessibility checks.
  • Reviewing landing pages before SEO publication.
  • Training content teams on proper heading structure.

Tips for better results

  • Use one meaningful H1 per page for primary topic clarity.
  • Follow sequential nesting (H2 then H3, avoid jumps).
  • Keep headings descriptive rather than generic labels.
  • Separate visual styling from semantic heading choice.

Mistakes to avoid

  • Using heading levels only for font size styling.
  • Skipping from H2 directly to H4 without hierarchy reason.
  • Duplicating multiple unrelated H1 elements in content body.
  • Leaving empty headings for spacing/layout hacks.

Frequently asked questions

Search engines use headings to understand what a page is about and how content is organized. Screen reader users often navigate directly by headings, so a logical, well-nested structure makes a page much easier to navigate non-visually.

Generally just one - the H1 should represent the main topic/title of the page, with H2s and lower levels breaking down subtopics beneath it.

It means jumping from, say, an H2 directly to an H4 without an H3 in between - this breaks the logical nesting hierarchy, which can confuse screen readers and make the content structure harder to follow.

Yes. HTML Heading Checker is free for normal use with no account required, and ToolBox does not add a watermark to your result.

Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.

No install needed. Open HTML Heading Checker in your browser, add your file or paste your input, then download or copy the result.

Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.

Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.

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