HTML Heading Checker
Paste page HTML to see its H1–H6 outline and find SEO issues like missing or multiple H1 tags.
100% free No signup Private & offline-ready Works in your browser
About the HTML Heading Checker
Headings (H1–H6) give your page a clear outline for readers, screen readers and search engines. Best practice is one H1 that describes the page, H2s for main sections, and H3s inside them without skipping levels. Paste any page's HTML to see its outline and a list of issues to fix.
Frequently asked questions
Is the HTML Heading Checker free?
Yes. The HTML Heading Checker on Apex Tool Station is 100% free with no signup and no watermark. Browser tools have no usage limits.
Are my files or data uploaded to a server?
No. Everything runs locally in your browser using JavaScript. Your files and text never leave your device, which makes it safe for private documents.
Does it work on mobile?
Yes. The tool works on any modern browser on Android, iPhone, Windows, Mac and Linux.