Heading Structure Checker
Check your page's H1-H6 heading hierarchy for SEO and accessibility issues like missing H1s or skipped levels.
Runs entirely in your browser — your files are never uploaded to a server.
How It Works
1. Choose Your File
Drag & drop or select the file you want to work with.
2. Processed in Your Browser
Everything happens locally on your device — your file is never uploaded anywhere.
3. Download Your Result
Get your finished file instantly, ready to save or share.
Frequently Asked Questions
Why does heading structure matter?
Search engines and screen reader users both rely on heading hierarchy to understand a page's structure — a broken hierarchy can hurt both SEO and accessibility.
How many H1 tags should a page have?
Exactly one. Multiple H1s or none at all can confuse both search engines and assistive technology.
What does "skipped level" mean?
t means your headings jump, like going from an H2 straight to an H4 without an H3 in between — this breaks the logical outline of your page.
Do I need to paste my whole page?
No, just the HTML containing your headings works fine — the tool only looks for h1 through h6 tags.