Heading Structure Checker: Audit H1–H6 Tags
Well-ordered headings help both readers and search engines understand your page. This heading structure checker fetches any public URL and lays out its H1 to H6 tags as an indented outline in document order. See the count for each level, confirm there is exactly one H1, and instantly spot skipped levels, duplicate H1s or empty heading tags — all free, with nothing to install.
Your heading outline will appear here
Enter a URL and click Analyze to see the full H1–H6 structure.
H1
0
H2
0
H3
0
H4
0
H5
0
H6
0
Structure issues
No structural issues found — the heading hierarchy looks well-formed.
Heading outline
Headings are shown in document order and indented by level. Warnings mark a skipped level.
How to use
- Paste the page URL into the box (we add https:// if you leave it off).
- Click Analyze — the tool fetches the page and reads its heading tags.
- Review the indented H1–H6 outline and the per-level count summary.
- Check the issues list for missing H1, multiple H1s or skipped levels.
- Copy the outline or export it to CSV to share with your team.
Features
- Full H1–H6 outline shown in true document order
- Per-level count summary for H1 through H6
- Flags missing H1, multiple H1s and first-heading-not-H1
- Detects skipped heading levels (for example H2 jumping to H4)
- Handles Thai and UTF-8 pages, including legacy TIS-620 encoding
- Copy the outline or export to CSV — 100% free, no sign-up
Frequently asked questions
What is a good heading structure for SEO?
Use one H1 for the main topic, then nest H2s for sections and H3s for sub-points, without skipping levels. A logical H1–H6 order helps search engines understand your content and improves accessibility for screen-reader users.
Should a page have only one H1?
In most cases, yes. A single H1 gives the page one clear topic. Multiple H1s are valid in HTML5 sectioning but can dilute the main subject, so this tool flags pages with zero or more than one H1 as a warning.
What does "skipped heading level" mean?
Skipping a level means jumping from, say, H2 straight to H4 without an H3 in between. It breaks the outline hierarchy and can confuse assistive technology. The checker highlights every skipped level so you can add the missing heading.
Does this tool read JavaScript-rendered headings?
It reads the raw HTML the server returns, so headings added later by client-side JavaScript may not appear. For pages built mostly with JavaScript, compare the result against the rendered DOM in your browser dev tools.
Is the heading structure checker free?
Yes, it is completely free with no sign-up or limits. Your URL is fetched server-side only to read its headings; nothing is stored, and results are shown straight back in your browser.