01 / THE ORIGINAL, REIMAGINED
A little checkup.
For a healthier web.
Spot common HTML issues and understand how to fix them.
A practical second pair of eyes, at the original Doctor HTML address.
Ready for a checkupNO ACCOUNT NEEDED
Your checkup
Small details. Better websites.
Add your HTML and run a checkup.
We’ll point out what deserves a closer look.
Useful checks, clearly explained.Local source analysis · No sign-up · Free to use
KNOW WHAT YOU’RE CHECKING
A good starting point.
With honest boundaries.
This checkup looks for selected issues in HTML source: missing titles, document language and viewport metadata, duplicate IDs, image alt attributes, form labels and heading structure.
It does not execute JavaScript, inspect the rendered page, validate every HTML rule or certify accessibility. The browser may repair malformed markup while parsing, so some syntax issues will not appear here. Fragments can trigger document-level warnings.
How to use your HTML checkup →