HTML Validator

Add HTML Validator in Developer Tools
What is HTML Validator?
'HTML Validator' is a Chrome extension based on HTML Tidy algorithm originally developed by W3C. It enables validation of your HTML codes right inside the developer tools of your Chrome browser. It identifies HTML errors and categorizes them for easy resolution. With the 'Clean up' feature, it can even offer a version of your HTML page free from errors. All these tasks are performed locally, ensuring your HTML codes are not sent to any third-party server.

Extension stats

Users: 40,000+
Rating: 3.35 (37)
Version: 0.9.9.8 (Last updated: 2022-12-28)
Creation date: 2018-05-28
Risk impact: High risk impact
Risk likelihood: Very low risk likelihood
Manifest version: 3
Permissions:
  • storage
  • activeTab
  • clipboardWrite
  • webNavigation
  • scripting
Host permissions:
  • <all_urls>
Size: 2.62M
URLs: Website

Other platforms

Not available on Firefox
Not available on Edge
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Extension summary

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

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Allows viewing the source directly from the HTML validator tab in dev tools.
  • Helps identify inaccuracies and errors in templates.
Cons
  • Does not refresh or update the page analysis after a reload.
  • Not fully HTML5 compliant, providing false errors/warnings.
  • Plugin frequently crashes and is barely usable.
Most mentioned
  • Does not refresh itself after a page reload.
  • Provides false errors/warnings.
  • Plugin crashes often.
Recent reviews
Extension not maintained ! Unable to refresh the analysis . the "HTML Validator" tabs keeps always the old release , even when i refresh the page CTLR+R. This important issue was logged 3 years ago ! (see #61 in gitlab issues)
by Reda Benh, 2024-10-04

It does not refresh itself after a page reload :(

Pretty decent, but it doesn't seem to be fully HTML5 compliant. It didn't like me using "checked" instead of checked="checked", both of which are valid for HTML5.
by Carmody Staff, 2022-12-22
View all user reviews

Extension safety

Risk impact

HTML Validator requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

HTML Validator has earned a good reputation and can be trusted.

Upgrade to see risk analysis details

Promo images

HTML Validator small promo image
Small promo image

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