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Free Heading Structure & Title Length Checker.

A clean heading hierarchy is one of the cheapest accessibility and SEO wins available. Exactly one H1. H2s for sections. H3s for subsections. Levels never skipped. Screen readers use this to build a page outline; Google uses it to understand structure and to build featured snippets.

Paste your page HTML below. You'll get a visual outline, warnings for every violation (multiple H1s, skipped levels, empty headings), and a title-length check against Google's ~580 px limit.

Paste full HTML, or a Markdown-style outline (# H1, ## H2, ### H3…)

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FAQs — Heading Structure Checker

For accessibility, yes — screen readers rely on a single H1 for orientation. For SEO, Google has said modern algorithms tolerate multiple H1s, but there's no upside to breaking the convention. One H1, always.

It breaks the outline. Assistive tech infers structure from level order; skipping H3 tells a screen reader something is missing. If you want a smaller heading for visual reasons, keep the semantic level (H3) and style it with CSS.

The first <title> tag, and every h1–h6 in order. It parses the HTML in your browser using DOMParser — nothing is uploaded.

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