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Heading Structure Extractor
A heading structure extractor pulls every H1 through H6 out of a page’s HTML and lays them out as an indented outline, so the document’s real hierarchy becomes visible at a glance instead of being buried in markup. A clean heading outline is how both search engines and screen readers understand what a page is about and how its sections relate, which makes a malformed hierarchy, two competing H1s, or a level that jumps from H2 straight to H4 a problem worth catching before it ships.
This tool is free and runs entirely in the browser. Paste the HTML of a page or its full view-source, and the outline, per-level counts, and hierarchy flags are computed locally with the same DOMParser a browser uses. Nothing is uploaded, so it is safe for staging pages and unpublished drafts.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
How to use the heading structure extractor
Paste a page’s HTML into the box and the outline updates as you type. Each heading is shown with its tag and indented by level, the counts strip totals every level, and the flags call out missing or duplicate H1s and any skipped levels.
Aim for exactly one H1 per page
The H1 is the page’s main title, and search engines treat it as the strongest on-page signal of the primary topic. A page with no H1 leaves that signal blank, while a page with several H1s splits it across competing headings and weakens all of them. The extractor counts H1 tags first and flags both cases in red, so the fix is unambiguous: keep one H1 that names the subject of the page, and demote every other top-level heading to an H2 or deeper where it belongs in the outline.
Never skip a heading level
Heading levels are meant to nest like a table of contents: an H2 opens a section, H3s sit under it, H4s under those. Jumping from an H2 straight to an H4 skips a rung and breaks the nesting, which confuses assistive technology that navigates by heading level and muddies how crawlers map your sections. The tool walks the headings in document order, marks any jump deeper than one level, and names the exact transition, such as H2 to H4, so each gap can be closed by inserting or relabelling the heading in between.
Read the outline as a content brief
Once the hierarchy is valid, the indented tree doubles as an audit of the content itself. Reading top to bottom should feel like skimming the page: the H2s are the chapters, the H3s the supporting points, and a section with one lonely subheading or a wall of same-level H2s usually signals structure that needs rethinking. Because the outline strips away styling and shows only the headings, it surfaces thin sections, missing subtopics, and duplicate phrasing that are easy to miss when reading the rendered page.
Heading structure extractor frequently asked questions
Q1Why should a page have only one H1?
The H1 is the strongest on-page signal of a page’s main topic, and using one keeps that signal focused. Multiple H1s split the emphasis across competing headings, and a missing H1 leaves the page without a clear title for crawlers and screen readers. This tool counts H1 tags and flags both problems so you can keep exactly one and demote the rest to H2.
Q2What is a skipped heading level and why does it matter?
A skipped level is a jump deeper than one rung, such as an H2 followed directly by an H4 with no H3 between them. It breaks the nested outline that screen readers and search crawlers rely on to understand how sections relate. The extractor walks the headings in order, marks each jump, and names the exact transition so you can insert or relabel the missing level.
Q3Does this heading extractor send my HTML anywhere?
No. The HTML you paste is parsed entirely in your browser using the built-in DOMParser, and nothing is uploaded, logged, or stored on any server. The tool keeps working offline once the page has loaded, which makes it safe for staging environments, password-protected pages, and unpublished drafts you are not ready to share.
Q4Can I paste a full page source or just a snippet?
Either works. You can paste a complete view-source dump, a copied article body, or a small block of markup, and the tool extracts whatever H1 through H6 elements it finds in document order. Headings inside nested elements are still detected, and surrounding scripts and styles are ignored, so you do not need to clean the markup before pasting it in.
Q5Do scripts in the pasted HTML run when I extract the outline?
No. DOMParser builds a detached document that is never attached to the live page, so script tags in your pasted HTML do not execute and no external resources are fetched. The parser only reads the heading elements and their text. This is what makes it safe to paste source from pages you do not control without risking any side effects.
