The Heading Structure Analyzer is a free online tool that analyze h1-h6 heading hierarchy from html or markdown. detect seo issues, visualize the outline, and score your structure.. It runs entirely in your browser with no installation or sign-up needed.

Paste HTML or Markdown and the tool parses h1-h6 (or # levels) entirely in your browser to build an outline, detect issues, and score the structure.

Jumping H1 → H3 breaks the document outline that screen readers and search engines rely on to understand hierarchy. Always step one level at a time.

Exactly one. A single H1 describes the main topic; all other sections should use H2 and below.

Yes, the Heading Structure Analyzer is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Heading Structure Analyzer processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Heading Structure Analyzer is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Heading Structure Analyzer in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Yes, the Heading Structure Analyzer is built following current Google Search guidelines and best practices. We regularly update the tool to reflect changes in search engine requirements.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.