HTML Validator & Formatter

Check your HTML for common errors and format it with proper indentation. Client-side only — nothing sent to any server.

How to Use This Tool

  1. 1Paste your HTML into the input box
  2. 2Click Validate
  3. 3Review errors and warnings in the results panel
  4. 4Fix issues in the editor and re-validate
  5. 5Click Format to beautify your HTML

Frequently Asked Questions

Does this validator check accessibility?

The tool checks for common accessibility issues like missing alt attributes on images and improper heading structure, in addition to HTML validity.

Should my HTML have zero errors?

Aim for zero errors. Warnings are lower priority but should be addressed. Valid HTML renders more consistently across browsers.

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