Enter any page URL and our H1 checker fetches it, lists every <h1> tag, shows the full H1 / H2 / H3heading outline, and grades the page against the “one descriptive H1” best practice.
What is an H1 checker?
An H1 checker is a free tool that loads any web page and shows its <h1>tag(s), grading the page against the “exactly one descriptive H1” rule. It's also a full heading checker / heading tag checker — an SEO H1 checker and H1 tag analyzer that shows your H1, H2 and H3 structure together.
H1, H2 & H3 heading checker
Good pages use a logical heading hierarchy: one H1, then H2s and H3s for subsections. This h1 h2 checker / h1 h2 h3 checkerextracts your page's full outline in document order with per-level counts, so you can spot skipped levels or multiple H1s at a glance — a true SEO heading checker.
How many H1 tags should a page have?
Exactly one. A single descriptive H1 is a strong on-page signal of your page's topic and helps screen-reader users. This h1 header checker flags pages with zero or multiple H1s, and the built-in h1 length checker warns when your H1 falls outside the ideal 20–70 characters.
How to use the H1 checker
Paste a page URL into the h1 checker tool above.
Click “Check H1” — we fetch the live page and read its headings.
Review the H1 count and length, plus the full H1/H2/H3 outline.
Fix issues: keep one descriptive H1 and a clean heading hierarchy.
Why H1 and headings matter for SEO
Headings give both readers and search engines the structure of your content. A clear H1 and logical H2/H3 outline improve readability, accessibility, and topical clarity. Pair this tool with our Title Tag Checker, Meta Description Checker, and the full free SEO tools suite.
Frequently asked questions
An H1 checker is a free SEO tool that fetches any page and shows its <h1> tag(s), then grades the page against the “exactly one descriptive H1” best practice. It also doubles as a heading checker / heading tag checker, showing your full H1, H2 and H3 outline.
Exactly one. A single, descriptive H1 tells search engines and screen readers the main topic of the page. Multiple H1s dilute that signal — use H2 and H3 for subsections instead. This SEO H1 checker flags pages with zero or more than one H1.
Yes. As well as the H1, this h1 h2 h3 checker extracts your page's full heading outline in document order, with H1/H2/H3 counts — so you can verify a logical, hierarchical heading structure (a real heading tag checker, not just H1).
Aim for roughly 20–70 characters — long enough to be descriptive, short enough to stay clear. Our built-in h1 length checker shows the character count of each H1 and warns when it's too short or too long.
Paste the page URL into the h1 checker above and run it. We fetch the live page, extract every H1 (plus the H2/H3 outline), and report the count, length, and a pass/warn/fail verdict — free and online.
Completely free, with no account required. It's part of WebsiteAuditTools' free suite of on-page SEO checkers.