Free Heading Tag Checker
Paste a page’s HTML, or type an outline, to see the H1–H6 structure as a visual tree. The check flags missing or multiple H1s, skipped levels, empty headings, long headings, and duplicates.
This is a practical outline checklist, not a Google ranking score.
Heading tree
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What this free heading tag checker does
This page is a free, in-browser heading tag checker. You paste the live HTML of a page, or you type an outline, and the tool draws an H1–H6 tree. It then flags problems that make a page harder to scan: a missing or repeated H1, a skipped heading level, an empty heading, a very long heading, or the same heading text used more than once.
It does not replace the fuller guide on how to use heading tags properly, and it is not a Google ranking score. Google has said that multiple H1 headings are not a ranking problem, and that heading order is not a ranking rule. This tool still flags those items so you can check the outline a reader, or a screen reader, will move through.
If you also want titles, descriptions, images, and links, use the free SEO audit tool. For a full workflow that starts in Search Console, see the simple SEO audit guide.
What the tool checks
The check runs entirely in your browser. Nothing you paste is sent to this site.
- A visual tree of every H1–H6 heading in the chosen scope, indented by level.
- The H1 count. One clear H1 is treated as good practice. Zero H1s, or more than one, is a warning. Multiple H1s are not marked as a fail, because that would overstate Google's position.
- Skipped levels, such as an H2 followed by an H4.
- Empty headings, which are marked as a fail because they leave a blank stop in the outline.
- Headings longer than 70 characters. That number is a practical readability prompt, not an official Google limit.
- Duplicate heading text, which is common when a Blogger theme reprints a title in a sidebar.
- An optional focus phrase, checked in the H1 and the H2s. This is a writing check, not a density target.
- Heading counts by level, plus a short checklist score.
A full-page paste includes the theme. Sidebar widgets, “Popular Posts,” comment headings, and footer headings will appear in the tree. That is honest: it is the document a visitor and a crawler actually receive. When you want to ignore those template headings, switch the scope to Main article only.
How to use it
Mode 1: Paste page HTML
This is the mode that shows the live outline, including the theme.
- Open the published URL you want to check, not only the Blogger editor preview.
- Open View Source (right-click, then View page source, or Ctrl+U / Command+U).
- Select all, copy, and paste the full document into the box. You should see the doctype and the head, not only the post body.
- Optional: enter a focus phrase if you want the keyword check.
- Choose Check headings. Read the tree first, then the fail and warning cards.
- If the tree is crowded with sidebar titles, switch to Main article only and compare the two views.
- Fix the issue, publish, copy the live source again, and retest.
If you paste only the post body from Blogger's HTML view, you will miss the theme's title H1. For a complete reading, use the live source.
Mode 2: Type an outline
Use this when you are planning a post, or when you want to test a structure without pasting a full page. Enter one heading per line, in Markdown:
- # for H1
- ## for H2
- ### for H3, and so on
You can also write lines such as H1: Title and H2: Section. The checker reads only those marked lines. Ordinary paragraphs are ignored, so a block of unmarked text will return a short error rather than a fake outline.
How to read the score and the outline
The 0–100 number is a weighted summary of the checks. Pass items give full weight, warnings give half, and fails give none. Info items, such as a heading count or a skipped keyword check, do not drag the score down.
Read the tree, not only the number. A score in the 70s or 80s on a full Blogger page often means the theme printed a second H1 or reused a long post title in the sidebar. Open Main article only before you rewrite the post. The category bars (H1, Outline, Clarity, and Focus) show where the weight sits. Use the Pass, Warning, and Fail filters to work through the list, and open a card for the fix tip.
You can copy the plain-text outline, copy a fuller report, or print the results. The report is a snapshot of this check, not a certificate.
Limits of this tool
The checker cannot log into Search Console, crawl your whole site, or tell you whether a URL is in Google's index. It does not fetch other websites, because browsers block that kind of request, and this page does not use a proxy. It also cannot always tell a visually hidden heading from a visible one, because a paste does not include the live layout.
The score is not used by Google. A clean outline helps people move through the page. Useful content, a page that can be indexed, and a clear snippet still matter more than this number.
Related guides on Free Seo Lab
- How to Use Heading Tags Properly (H1, H2, H3 Guide) — the writing guide this tool supports.
- Free SEO Audit Tool — a broader on-page check, including titles, images, and links.
- How to Do a Simple SEO Audit with Free Tools (Step-by-Step Guide)
- How to Write SEO-Friendly Blog Posts (Simple Guide for Beginners)
- Technical SEO Checklist for Beginners
Frequently asked questions
Does a high score mean the page will rank better?
No. The score is a checklist summary for this tool. Google does not use this number. A tidy outline is still worth having because people scan headings, and assistive technology often does the same.
Why is more than one H1 only a warning?
Because Google has said, clearly, that multiple H1 headings are not a ranking problem. John Mueller has described them as a common pattern, including in HTML5 templates. The warning exists so you can see whether the second H1 is the theme repeating the title, or a different heading that should probably be an H2.
Why do I have to paste HTML?
Browsers do not allow a page on one site to read the HTML of another site. This tool does not bypass that rule with a proxy. Paste the live View Source document, or type an outline instead.
Is my page source sent to this site?
No. The analysis stays in your browser.
Why does the tree show “Popular Posts” or “Contact form”?
Those headings come from the theme. They are part of the live page. Use Main article only to hide them, or leave them visible if you want to see the whole document.
Can I check a draft?
Typed outline mode is useful while you plan. Paste mode can also read any HTML you give it, but the most useful check is the live published page, because that includes the theme's H1 and the rest of the template.
Start with one important URL, paste the live source, and look at fail items first. Then use the heading guide when you want the fuller writing advice behind the flags.