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Heading Structure Analyzer

Analyze HTML heading hierarchy and detect multiple H1s or skipped levels.

Best for: Use it to audit a page's heading hierarchy for SEO and accessibility.

Complete guide

Input

How it's calculated & sources
The Heading Structure Analyzer uses the standard method for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Heading Structure Analyzer?
A heading structure analyzer extracts a page's H1-H6 headings and shows their outline, flagging skipped or missing levels.
Why does Heading Structure Analyzer matter?
The document outline. A good structure has one H1 and no skipped levels (don't jump H2 to H4) - important for SEO and screen readers.
How is Heading Structure Analyzer calculated?
It reads the heading tags in the HTML you paste and lays out the hierarchy, in your browser.
What are common heading structure analyzer mistakes?
Having multiple H1s or none.
When should you use the Heading Structure Analyzer?
Use it to audit a page's heading hierarchy for SEO and accessibility.

What is the Heading Structure Analyzer?

A heading structure analyzer extracts a page's H1-H6 headings and shows their outline, flagging skipped or missing levels.

How the Heading Structure Analyzer works

It reads the heading tags in the HTML you paste and lays out the hierarchy, in your browser.

Common mistakes to avoid

  • Having multiple H1s or none.
  • Skipping heading levels (H2 straight to H4).
  • Using headings for styling rather than structure.

Keywords: heading, h1, h2, structure, seo.

Sources: Google Search Central

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Heading Structure Analyzer free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Heading Structure Analyzer?+

Heading Structure Analyzer uses the standard heading structure analyzer formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Heading Structure Analyzer runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Heading Structure Analyzer on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free heading structure analyzer — instant, no signup

Body: Analyze HTML heading hierarchy and detect multiple H1s or skipped levels. Try it: https://freetoolsgalaxy.com/tools/heading-structure-analyzer
LinkedIn post
Heading Structure Analyzer on Free Tools Galaxy — Analyze HTML heading hierarchy and detect multiple H1s or skipped levels. https://freetoolsgalaxy.com/tools/heading-structure-analyzer
Medium intro
# Heading Structure Analyzer — the free tool I keep coming back to

Analyze HTML heading hierarchy and detect multiple H1s or skipped levels.

Try it: https://freetoolsgalaxy.com/tools/heading-structure-analyzer
Quora answer
The fastest way is to use a free in-browser heading structure analyzer: https://freetoolsgalaxy.com/tools/heading-structure-analyzer. Analyze HTML heading hierarchy and detect multiple H1s or skipped levels.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/heading-structure-analyzer?embed=1" title="Heading Structure Analyzer" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/heading-structure-analyzer" target="_blank" rel="noopener">Powered by Heading Structure Analyzer on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/heading-structure-analyzer?embed=1" title="Heading Structure Analyzer" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[Heading Structure Analyzer — free online tool](https://freetoolsgalaxy.com/tools/heading-structure-analyzer)

<iframe src="https://freetoolsgalaxy.com/tools/heading-structure-analyzer?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/heading-structure-analyzer" target="_blank" rel="noopener">Try the free Heading Structure Analyzer</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free image converter that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick image converter and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard image use cases (image, convert, png, jpeg) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/image-converter

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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