Version 23.04 Version 2023/v23.04 is now available.
OPTIONAL: Print this short Quick Start Guide to help you get started.
A new Mac (macOS) and Linux 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 limited version.
CSS HTML Validator for Personal/Educational, Non-commercial Use is a FREE older version for Windows 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.
After downloading a Windows setup installer, run it 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:
If you have a paid product, please use the above button to download your software. Thank you for your support!
Additional dictionaries are available to support more languages.
A dictionary editing tool is also available. This tool lets you create your own custom dictionaries.