HTML Tools
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HTML Validator

Click "Validate" to catch unclosed tags, duplicate ids, missing img alt attributes, and other common markup issues.

The HTML code is sent to our server only to run the check and is not stored.

Input code

Use cases

  • Quick markup check before publishing
  • Finding why a layout is breaking
  • Auditing someone else's HTML before editing it

FAQ

Is this the same as validator.w3.org?

No. This is a lightweight structural linter for common mistakes, not a full HTML spec conformance checker. Use the W3C Validator for official validation.

Is the code sent to a server?

No, checking happens entirely in your browser.

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Minify HTML by removing comments and extra whitespace. Local processing, no server.

HTML — Reference