Heading Structure Analyzer
100% PrivateSEO ToolsSee the H1 to H6 heading outline of pasted HTML as a clear, visual structure.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
Paste HTML to see its heading outline.
- 1Copy the page source (View Source in a browser) or any HTML fragment.
- 2Paste it into the box, or load the small built-in example.
- 3Read the indented outline to judge whether the hierarchy makes sense.
- 4Work through the structural warnings and fix them in your CMS or template.
HTML containing an H1 "Pour Over Coffee Guide", H2 "What you need", H3 "Grinder", H2 "Brewing steps", H4 "Water temperature" and H2 "Common mistakes" produces a six-line outline and exactly one warning: the H2 "Brewing steps" is followed directly by an H4, skipping H3. Promoting "Water temperature" to H3 clears the warning.
- Pasted HTML is parsed in an inert document: scripts do not run and no external resources are loaded.
- The analyzer checks structure only (levels, order, emptiness). Whether a heading's wording is good is a writing judgment it cannot make.
- Pages built by JavaScript frameworks may show different headings in raw source than in the rendered page; paste the rendered HTML from developer tools for those.
HTML5 allows several H1s in separate sections, but for SEO and accessibility a single clear H1 stating the page topic is the safer, conventional choice, so the analyzer flags multiples as a warning, not a hard error.
About this tool
The Heading Structure Analyzer reads the HTML of a page and draws its H1 to H6 outline in document order, then flags the structural problems that confuse readers and search engines: missing or multiple H1s, skipped heading levels, and empty headings. The pasted HTML is parsed locally with DOMParser and never executed.
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