HTML Validator

Name: HTML Validator
Rating: 3.39 (38 reviews)
Author: Marc Gueury

Add HTML Validator in Developer Tools

As of May 2026, HTML Validator has 30,000 users and a 3.39/5 rating from 38 reviews in the Developer Tools category.

Marc Gueury Developer Tools★ Featured

Chrome Web Store ↗.crx

Users0%

30.0K

30,000

Rating0%

3.39

38 reviews

Reviews0%

Version

0.9.9.8

Manifest V3

History

1 snapshots

Tracking since Apr 30, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 30, 2026	30.0K	3.39	38	0.9.9.8
Now	30.0K	3.39	38	0.9.9.8

Permissions & access

Permissions: storageactiveTabclipboardWritewebNavigationscripting
Host access: <all_urls>

Screenshots

About

This is the of HTML Validator extension for Chrome Manifest V3.
It checks the code, syntax, of your HTML 5 pages.

HTML Validator for Chrome is a browser extension that adds HTML validation inside Developer Tools of Chrome. The number of errors of a HTML page is seen with an icon in the browser status bar. The details is seen in the developer tools.

The extension is based on HTML Tidy. The algorithm was originally developed by the Web Consortium W3C. The algorithm is embedded inside your browser and makes the validation locally on your machine, without sending  HTML to a third party server.

HTML Tidy is a helpful program that tries to help people to correct their HTML errors. It finds HTML errors and classifies them in 3 categories:
* errors: HTML errors that Tidy cannot fix or understand.
* warnings: HTML errors that Tidy can fix automatically
* (optional) accessibility warnings: HTML warnings for the 3 priority levels defined in W3c WAI

There is also an automatic "Clean up" button that will do his best to propose you a cleaned version of your page, without errors.

For any question, mail me at [email protected] or log a bug in: 
> https://gitlab.com/mgueury/html_validator/issues