Heading Structure Analyzer

Check H1–H6 hierarchy for SEO and accessibility problems.

Page HTML

View source on your page and paste it here. Nothing is fetched or uploaded.

What does Heading Structure Analyzer do?

Paste HTML to see the heading outline as a tree, with problems flagged: multiple H1s, skipped levels, empty headings and headings that are far too long. Heading order matters for screen readers as much as for search engines.

How to Use Heading Structure Analyzer

1
Paste your page HTMLView source and copy, or paste a fragment.
2
Review the outlineIndentation shows the hierarchy.
3
Fix the flagged issuesEach one explains the problem.

Key Features

Visual heading outline as an indented tree
Flags multiple H1s and skipped levels such as H2 to H4
Detects empty headings and headings over 70 characters
Counts headings at each level
Explains why each issue matters for screen reader users
Copy the outline as Markdown for documentation

Frequently Asked Questions

Should a page have only one H1?

One is the safest convention. HTML5 technically allows several within sectioning elements, but the outline algorithm that justified it was never implemented by browsers or screen readers. One H1 naming the page topic is unambiguous.

Why does skipping heading levels matter?

Screen reader users navigate by heading level and infer structure from it. Jumping from H2 to H4 implies a missing section, which is confusing. Use CSS to control size, not the heading level.

Do headings affect SEO?

They help search engines understand structure and topic, though far less than a decade ago. The stronger argument for getting them right is accessibility, where the impact on real users is direct.

How long should a heading be?

Short enough to scan — under about 70 characters. A heading that runs to a full sentence is usually a paragraph in disguise and defeats the purpose of a scannable outline.

Runs in your browser

Analysis runs on the text or HTML you paste, inside your browser. Nothing is fetched from your site and nothing is uploaded, so the tools work on staging environments and pages behind a login.

How the rest of the site handles data