CSE HTML Validator Standard, Professional, and Enterprise are professional web developer tools and are significantly more powerful than CSE HTML Validator Lite. Unlike the lite edition, these editions are not free and you must buy a license to use it after the trial period.
For evaluation purposes, CSE 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 CSE 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).