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H1 checker
Check any page's H1 tag: how many there are, what they say, and whether the H1–H6 outline below them skips levels. Enter a URL or paste the HTML.
Quick answer
What does this H1 checker measure?
This tool extracts H1–H6 elements from fetched HTML or HTML you paste. It reports counts, text, empty headings, repeated H1 text and jumps between heading levels. Its warnings are structural review prompts, not indexing, ranking, accessibility-conformance or AI-citation certification.
Use headings to describe the content
Give the page a meaningful main heading and use lower-level headings for actual sections. Review repeated or empty headings in context rather than changing tags solely to improve a tool score.
The checker flags an H1 longer than seventy characters as a heuristic. That is not a search-engine limit or a required character target.
Review the outline in context
A jump from H2 to H4 is worth reviewing for logical nesting. The tool reads document order; it does not understand every section relationship or test navigation with assistive technology.
Multiple H1 elements receive a warning. Count alone does not prove the page cannot rank or be indexed. Check whether headings communicate the actual structure clearly.
Know which HTML was checked
URL mode fetches source HTML without executing page JavaScript. Headings added later may be absent. Paste rendered HTML to inspect those elements.
Heading text uses DOM textContent, so image alternative text is not included in the extracted text. An image-only heading can therefore receive an empty-text finding; inspect its alternative text and context before changing it.
Where this data comes from
The browser DOM parser extracts H1–H6 elements in document order from supplied HTML. The audit uses textContent, checks H1 counts and repeated text, flags empty heading text and downward level jumps, and applies a seventy-character H1 review threshold. URL mode does not execute JavaScript. No citation, ranking or accessibility-conformance test is performed.
Frequently asked questions
Does this checker prove my headings are SEO compliant?
No. It reports selected structural findings. Review the content, template and actual rendered page before deciding what to change.
Is seventy characters an H1 limit?
No. It is this tool’s review threshold, not a search-engine limit. Use a clear heading of appropriate length for the page.
Does more than one H1 prove an indexing problem?
No. The tool flags multiple H1 elements for review; the count alone is not an indexing or ranking verdict.
Why can an image-only H1 appear empty?
The extractor uses textContent, which excludes image alternative text. Inspect the image’s alt attribute and context before treating the finding as missing accessible content.
Why are some visible headings missing?
URL mode does not execute JavaScript, and fetched source can differ from the rendered page. You can paste rendered HTML for a separate check.
Do clean headings guarantee AI citations?
No. This tool does not measure citations or predict whether a search or AI service will use a page.
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