Download CSS HTML Validator for Windows

Version 23.02 Version 2023/v23.02 is now available.

Download CSS HTML Validator Pro Trial for FREE

Download Free Trial (Windows)

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

Downloads for Registered Users with Paid Licenses

Download Paid Version

Download for Personal/Educational, Non-commercial Use (FREE)

CSS HTML Validator for Personal/Educational, Non-commercial Use is a FREE older version that is licensed only for personal (or educational), non-commercial use. Download this free version here. Note that a newer paid version is required if you want the best and most up-to-date validation results.

New CSS HTML Validator for Linux and Mac

A new Linux and Mac (macOS) command line (console) tool based on the core validation engine in CSS HTML Validator is now available. Visit htmlval for Linux or htmlval for Mac to download a FREE trial.

After Downloading

After downloading, run the setup installer and answer Yes to the User Account Control prompt then follow the simple installation instructions. The setup program is digitally signed by AI Internet Solutions LLC (do not run it if it is not).

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

If the User Account Control dialog does not appear or you get an error message like "Error 5: Access is denied." then please try one or more of the following:

• Run the setup program by right-clicking on it and choosing Run as administrator.
• Temporarily disable any security software like anti-virus and anti-spyware (it may be preventing the setup program from running).
• If problems persist then please see Known Issues with 3rd Party Software.

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.