CSS HTML Validator Standard, CSS HTML Validator Professional (or Pro), and CSS HTML Validator Enterprise are professional web developer tools. These editions are not free and you must buy a license to use CSS HTML Validator after the trial period.
For evaluation purposes, CSS HTML Validator Pro is free for 30 days or for the first 200 validations, whichever comes first. After the trial period, you must register the software by buying a license to use it.
Please visit the CSS HTML Validator Ordering Information Page (new window) to see current pricing or to buy a license online. You can also find out about any discounts that may apply to you. If you are a student, non-profit organization, or educational institution then you may qualify for a discount. Note that the price may change for future versions and that you will only be able to purchase the latest version at the current prices.
If you already have a license and want to upgrade or add priority support and maintenance (PS&M) to your license, then please visit the Buy Upgrade Page (new window).