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Heading Structure Checker online, free
Show a page's H1–H6 outline and flag a missing or repeated H1, skipped levels and empty headings.
- Runs in your browser — no upload
- Free, no sign-up, no watermark
- HTML
- TXT
How to use Heading Structure Checker
- 1
Add your HTML and TXT file
Drop a file on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.
- 2
Fine-tune the settings
Set source in the Fine-tune panel, or keep the defaults — they suit most files.
- 3
Run Heading Structure Checker
Press the start button. Processing happens on your device, usually in seconds.
- 4
Download the result
Save the finished file, or continue with another tool without downloading in between.
What Heading Structure Checker can do
- Source — Fetch a public URL, or paste the code and keep it on your device
- Private by design — files are processed in your browser and never uploaded
- Free with no sign-up, no watermark and no daily limit
Heading Structure Checker — frequently asked questions
Is the Heading Structure Checker really free?
Yes. The Heading Structure Checker is free forever on Sada Files — no ads, no premium tier and no account. Server-side fetches have a fair-use rate limit per visitor so the service stays fast for everyone.
Do I need to sign up?
No. There is no account system at Sada Files. Open the page, enter a URL or paste your code, and read the report.
Is my HTML uploaded in paste mode?
No. Paste mode builds the outline in your browser. Fetch mode downloads the page through our SSRF-safe fetcher (public addresses only, 10 s, 5 MB) and stores nothing.
What does it flag?
No H1, more than one H1, a first heading that is not H1, skipped levels (for example H2 followed by H4), empty headings, very long headings and the same heading text used several times.
Are headings inside scripts or comments counted?
No. Scripts, styles, templates and HTML comments are skipped, so the outline matches what readers and search engines see.
Why does heading order matter?
Screen-reader users navigate by headings and search engines use them to understand the topic of each section. A clean H1 → H2 → H3 outline helps both.
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