free upgrade incentive FREE UPGRADE: Buy v15 now (any edition) and automatically receive a FREE upgrade to v16 when available.

  • System Requirements: Microsoft Windows® Vista, Windows 7/8.1/10 (32 or 64 bit).
  • Validate up to 200 documents within 30 days with the trial version.
  • See what's new in the latest version.
  • The standard edition is not available as a trial download. Instead, try the professional edition. The standard edition is just like the professional edition minus a few features.
  • View the license agreement (EULA).
  • View the uninstall instructions.
  • Contact us if you have any problems or questions downloading.

Download CSE HTML Validator for Windows

Version 15.04 Version 15.04 is now available!

Download Trial Version (Pro)

RECOMMENDED: Print this short Quick Start Guide to help you get started.

Download Trial

The above link downloads from the primary download server. More download locations are available.

Downloads for Registered Users

Download Paid Version

If you have purchased a license then you can download the registered user version of CSE HTML Validator. You will need the registration information that was emailed to you.

After Downloading

IMPORTANT: On some systems it may take 1 to 2 minutes for this dialog to appear because the system is checking the file.

Answer yes to the User Account Control prompt

After downloading the setup file, run it and answer 'Yes' to the User Account Control prompt (shown above) then follow the simple instructions to install CSE HTML Validator.

Download Dictionaries

Download Dictionaries

Additional dictionaries are available to support more languages.

A dictionary editing tool is also available. This tool lets you create your own custom dictionaries.

The lite edition is also available. This edition is a less powerful edition designed for the casual and/or nonprofessional HTML author. It does not include accessibility, search engine, link, PHP, or JavaScript checking.