Heading Checker
Audit your H1–H6 heading structure — missing H1s, skipped levels, and duplicates — with a visual heading tree and actionable fixes.
Check a Page
Enter a URL to fetch it, or paste raw HTML source.
By Vizo ToolLast updated August 20265 min read
Heading Checker — Fix Your H1–H6 Structure in Seconds
The Heading Checker audits a page's heading structure — H1 through H6 — and reports hierarchy issues, duplicate headings, missing H1s, and skipped levels that hurt both SEO and accessibility.
Paste a URL or raw HTML and get a visual heading tree, a checklist of problems, and concrete fixes. Proper heading structure helps screen readers navigate your page and helps search engines understand your content — everything runs in your browser.
- H1–H6 hierarchy audit
- Duplicate & missing detection
- Visual heading tree
- Accessibility suggestions
Why Use Heading Checker?
Visual Heading Tree
See your entire H1–H6 structure as an indented tree that's easy to scan and understand.
Duplicate & Missing Detection
Flags multiple H1s, duplicate headings, and pages with no H1 — the most common SEO mistakes.
Accessibility Insights
Skipped heading levels are called out, since they confuse screen reader users navigating the page.
Actionable Fixes
Every issue includes a clear suggestion so you can correct your structure quickly.
Features
H1–H6 Extraction
Extracts every heading with its exact text, level, and order from the page.
Hierarchy Validation
Detects skipped levels (H1 → H3) and out-of-order headings automatically.
Duplicate Heading Check
Finds identical headings used more than once, which dilutes topic clarity.
Missing H1 Detection
Warns when a page has no H1 — or has more than one H1.
Heading Tree View
A collapsible visual tree of your heading structure with per-heading counts.
URL or HTML Input
Analyze a live URL via CORS proxy, or paste raw HTML for pages you can't fetch.
How to Check Heading Structure
Audit a page's headings in three simple steps.
Enter a URL or HTML
Paste the page URL to fetch it, or paste raw HTML source for a local or draft page.
Run the checker
Click Check Headings and the tool extracts and validates the full H1–H6 structure.
Fix the issues
Review the tree and suggestions — add a missing H1, remove duplicates, and un-skip levels.
Frequently Asked Questions
Got questions? We've got answers.
What is heading structure in SEO?▼
Heading structure is the H1–H6 outline of a page. It organizes content for users and signals topic hierarchy to search engines.
How many H1 tags should a page have?▼
Exactly one H1 per page is the safest, clearest practice — it defines the page's main topic. Multiple H1s dilute that signal.
What happens if I skip heading levels?▼
Skipping from H2 to H4 (skipping H3) confuses screen readers and can make your content hierarchy harder for search engines to parse.
Are duplicate headings bad for SEO?▼
They're a quality signal problem — identical headings suggest duplicate or thin content and waste the semantic value of your outline.
What is the difference between H1 and the title tag?▼
The title tag appears in search results and browser tabs; the H1 is the visible main heading on the page. They should be similar but can differ slightly.
How do headings help accessibility?▼
Screen reader users navigate pages by heading list. A logical H1–H6 order lets them jump between sections — skipped levels break that flow.
Is the heading checker free?▼
Yes, it's completely free with no sign-ups, no watermarks, and no usage limits.
Can I check a page I don't own?▼
Yes — paste the URL and the tool fetches it through a CORS proxy, or paste the HTML source directly.
Why can't the tool fetch some URLs?▼
Strict CORS policies or bot protection can block proxy fetches — in that case, paste the page's HTML source instead.
What does the heading tree show?▼
The tree lists every heading in order, indented by level, with the heading text and its tag (H1, H2, etc.) — making hierarchy problems obvious.
Do headings affect rich results?▼
Not directly, but clear headings help Google understand page structure, which supports accurate indexing and featured snippet selection.
How should I use H2 and H3 correctly?▼
Use H2 for main sections, H3 for subsections within an H2, and H4+ for deeper nesting — never skip a level when moving deeper.
Are the pages I check stored anywhere?▼
No — the analysis runs entirely in your browser. Nothing you fetch or paste is stored or uploaded.
Can I check headings in a CMS draft?▼
Yes — paste the rendered HTML from your CMS editor's code view to check a draft before publishing.
Does the checker work on mobile?▼
Yes, it's fully responsive and works on desktop, tablet, and mobile browsers.
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