Heading Structure Checker

A clear heading outline helps screen-reader users navigate and helps everyone scan a page. Paste HTML (view source, then copy) and the checker builds the outline locally with the browser’s HTML parser. Nothing is fetched or executed.

Page HTML

<title>Hiking boots guide</title>
<h1>Choosing hiking boots</h1>
<h2>Fit</h2>
<h4>Toe box</h4>
<h2></h2>
<h1>Newsletter</h1>

0Headings

0H1

0Issues

Runs entirely in your browser. Your input and files are not uploaded to any server.

How to use

Open your page, view its source and copy the HTML.
Paste it into the box.
Fix the reported issues in your template or editor.

Examples

Theme with two H1s

Logo and article title are both H1 → flagged as “multiple H1”.

Skipped level

H2 followed by H4 → flagged, with the heading text shown.

Privacy

Runs entirely in your browser. Your input and files are not uploaded to any server. See the privacy policy for what is stored in your browser (favorites and history only). Privacy policy

Check it yourself: open your browser’s developer tools, select the Network tab and use the tool. Your file never appears in an upload request. Once this page is saved for offline use, you can also disconnect from the internet and keep working. Ads and anonymous visit statistics, when enabled, make their own requests, but they never receive your files or text.

Frequently asked questions

Is more than one H1 an error?

HTML allows it and Google says it is fine, but a single H1 that describes the page is the clearest structure for accessibility. The checker reports it as a warning, not an error.

Are scripts in my HTML run?

No. The HTML is parsed with DOMParser into an inert document; scripts are not executed and images are not loaded.

Related tools

All SEO Tools

Structured Data ViewerPaste JSON-LD or page HTML to view schema.org items as a tree, find JSON errors and see which commonly expected properties are missing.

SERP Snippet PreviewSee an approximate Google-style search result for your title, URL and description on desktop and mobile, with pixel-width estimates.

Keyword Density CheckerFind the most frequent words and two- or three-word phrases in your text, with counts and percentages.

HTML Entity Encoder / DecoderEscape <, >, &, quotes and optionally all non-ASCII characters as HTML entities, or decode entities back to text.

Favicon GeneratorGenerate a complete favicon set from an image or a letter: favicon.ico, 16–512 px PNGs, Apple touch icon, web manifest and HTML tags, in one ZIP.

Slug GeneratorTurn titles into clean, lowercase URL slugs.