Heading Hierarchy Mapper
Map and analyze heading structure (H1-H6) for SEO compliance. Audit heading hierarchy, identify structural issues, and ensure proper heading levels for better SEO and accessibility.
Complete Guide: Heading Hierarchy Mapper
Everything you need to know about using this tool effectively
The Heading Hierarchy Mapper helps you inspect how H1 through H6 headings are arranged in a piece of HTML. It builds a nested outline, counts heading levels, and flags common structure issues such as missing H1s, duplicate H1s, empty headings, and skipped levels.
This tool is a browser-based heading structure analyzer for raw HTML. It is useful for reviewing page outlines, accessibility structure, and on-page SEO signals when you want a quick view of how headings are nested and whether the document flow makes sense.
On-page SEO review
Check whether a page uses headings in a clean order that supports the main topic and its sections.
Accessibility QA
Inspect heading flow so screen reader users and structured navigation patterns have a more logical outline.
Template testing
Review HTML output from templates or CMS layouts before publishing them across many pages.
Content editing
Audit long-form content after revisions to make sure the heading structure still matches the article flow.
Team review and reporting
Export a simple heading report when you need to show editors or developers where the hierarchy needs cleanup.
Choose HTML or URL mode
Use HTML mode for real markup review, or URL mode if you want to use the tool's built-in placeholder workflow.
Paste the source input
Add the HTML you want to audit, or enter a URL if you are using the tool's demo-style URL mode.
Run the hierarchy map
Generate the outline to see heading counts, structure depth, and any detected issues.
Review the warnings
Look for duplicate H1s, missing H1s, skipped levels, or empty headings that weaken the page structure.
Export or revise
Use the report for documentation, then adjust the source content to make the hierarchy more logical.
Use HTML mode for real audits because URL mode currently works as a placeholder example rather than a live fetch.
A clean hierarchy should reflect the document outline, not just visual styling preferences.
Do not force extra heading levels just to satisfy a rule if the section structure does not need them.
Review heading issues alongside the actual content flow, because a technically valid outline can still feel confusing to readers.
Fix missing or duplicate H1 problems first, then clean up skipped levels and empty headings.
What does this heading hierarchy mapper analyze?
It analyzes H1 through H6 tags in the input HTML, builds a nested outline, and reports structural issues such as missing H1s, duplicate H1s, skipped levels, and empty heading text.
Can it fetch and analyze a live page URL?
Not fully. The current URL mode uses placeholder HTML for demonstration, so HTML mode is the reliable option when you want to audit a real page structure.
Why do skipped heading levels matter?
Skipped levels can make the page outline harder to follow for both readers and assistive technologies. They are often a sign that sections were added without a clear document structure.
Should every page have exactly one H1?
That is usually the clearest pattern for a normal page, and this tool treats missing or duplicate H1s as issues worth reviewing.
Is heading hierarchy only an SEO concern?
No. It also affects accessibility, readability, and editorial clarity. A strong heading structure helps both search engines and human readers understand the page.