Validity 4.1.0 CRX for Chrome

A Free Developer Tools Extension

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Validity (bbicmjjbohdfglopkidebfccilipgeif): Click the icon in the address bar or press Alt+Shift+V to validate the current page. Results can be seen in Chrome's JS console.... Read More > or Download Now >

Validity for Chrome

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107.92 KB

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Tech Specs

  • • Type: Browser Extension
  • • Latest Version: 4.1.0
  • • Require: Chrome 53 and up
  • • Offline: No
  • • Developer:

User Reviews

  • 212 Votes, Average: 3.85 out of 5
  • • Rating Average
  • 3.85 out of 5
  • • Rating Users
  • 212

Download Count

  • • Total Downloads
  • 26
  • • Current Version Downloads
  • 1
  • • Updated: November 7, 2022

Validity is a free Developer Tools Extension for Chrome. You could download the latest version crx file or old version crx files and install it.

More About Validity

Validity can be used to quickly validate your HTML documents from the toolbar.

Just click the icon in the toolbar to validate the current document without leaving the page. The number of validation errors can be seen in the tool tip and the detail can be seen in the console tab of Chrome's developer tools.

Validity also gives you the option to use your own installation of the W3C Validation Service. (For more information on installing the W3C Validation Service see the documentation at

*** PLEASE DO NOT POST BUG REPORTS AND FEATURE REQUESTS IN THE REVIEWS ON THIS PAGE as they are unlikely to be actioned, use the GitHub issue system instead ( ***

Change Log:

4.0.0 (06/11/2016)
* Validity now uses the Nu Validator ( by default.
* Added option to use legacy W3C Validator for custom instances.

3.3.1 (29/09/2016)
* Added developer info to options dialog.

3.3.0 (28/09/2016)
* Warnings are now shown for valid documents. (#70)

3.2.2 (23/08/2016)
* Changed default validator, due to breaking change in W3C hosted instance.

3.2.1 (07/08/2016)
* Corrected the default validator in the options UI.

3.2.0 (31/07/2016)
* Changed default validator to W3C hosted instance.
* Fixed #68 error pages (response other then 200) cannot be validated.

3.1.0 (17/01/2016)
* Suppressed the "This interface to HTML5 document checking is obsolete." message.

3.0.1 (26/04/2015)
* Changed the default validator to an instance run specifically for Validity.
* The validator uses SSL encryption by default, scoring an A on SSL Check (
* The new validator instance should also fix the "Bad Gateway" errors, which are believed to be due to rate limiting on the W3C Validator.

2.0.2 (14/07/2014)
* Fixed a bug in loading the custom validator value on the options page.

2.0.1 (11/07/2014)
* Fixed a bug when the validator message contains a quote.

2.0.0 (09/07/2014)
* Support for Retina & high dpi displays.
* Regular expressions are now supported for host matching in options.
* The keyboard shortcut can now be changed via the "Keyboard shortcuts" dialog on the extension management page.
* Options are now synced via your Google or Opera Sync account.
* Regular expressions can now be used to match hosts.
* Rewrote the build script to use Grunt and include unit tests and linting.

1.3.0 (23/05/2013)
* Wildcards are now supported in specified and automatically validated hosts.
(Thanks to David Godfrey -

1.2.4 (23/03/2012)
* Fixed bug with keyboard shortcut, introduced in 1.2.3.
* Restored default of true to collapse result option.

1.2.3 (14/03/2012)
* Collapse results option is now honoured.

1.2.2 (22/09/2011)
* No line is given when an error is not specific to a line.
* When one error is found, console output is no longer plural.
* An error is no longer thrown when a message contains a line break.
(Thanks to Mathieu Turcotte -

1.2.1 (17/08/2011):

* Fixed a bug where domains with hyphens were not recognised for auto validation and enabling for specific hosts.
(Thanks to Luke Armstrong -

1.2.0 (19/07/2011):

* HTTPS pages are now supported.
* More improvements to the Options UI.
* Reduced memory and CPU footprint.

1.1.0 (23/01/2011):

* Validator warnings are now displayed with errors in the console.
* Improvements to the options UI.

1.0.0 (13/11/2010):

* Complete rewrite.
* Supports installs of legacy versions of the W3C Validator commonly found in software repositories.
* Source code is now hosted on GitHub (

* Pages are now sent to the validator as a fragment, meaning that pages are not required to be accessible to the validator.
* Validation errors are now detailed in the Javascript console.

Download Validity 4.1.0

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