Version 16.02 is now available!
  • Licenses start at only $69.
  • Use one license on up to two computers if you are the only user of both computers.
  • Licenses are NOT limited by number of websites or domains.
  • Your purchase is backed by our 30-day money back guarantee.
  • You can also buy from a software reseller.

Problem Ordering?

  • Please try a different browser, preferably one running fewer plug-ins and add-ons.
  • One such plug-in reported to cause problems is Privacy Badger.
  • Contact us if you have any problems or questions.

CSE HTML Validator Detailed Buying Information

CSE HTML Validator Box

Upon registering, you will receive a registration name, PIN, and key by email. After you receive your registration information, you can then download a registerable version and convert it into the full version by entering your registration information.

No software or printed documentation is physically sent to you because the latest version (with electronic documentation) is always available for download on the Internet. However, you can download the setup program and store it on a disc or other backup location for safekeeping.

There are several ways to buy CSE HTML Validator. All of them are listed here.

If you wish to buy two or more licenses, then you may qualify for a volume discount if you buy them at one time with a single order. If you are buying the standard edition, then you may also qualify for another discount if you are a student, non-profit organization, or educational institution and the license will NOT be used for business or government use.

Price per License (in USD)
Quantity Enterprise Professional Standard
1 Buy Now for $349 Buy Now for $129 Buy Now for $69
2-9 $299 $109 $69
10-19 $199 $89 $59
20 or More $199 $79 $49

Compare Editions Site Licenses

BlueSnap accepts Visa, Mastercard, American Express, Discover, and more

NOTE: The standard edition includes 60 days of FREE upgrades. The professional edition include 180 days of FREE major upgrades. The enterprise edition includes one year of priority support and maintenance (PS&M). There are other differences as well.

Discounts for students, non-profit organizations, and educational institutions are also available.

Compare Editions  Gov't Information  Site Licenses  Buy Upgrade  Upgrade Policy  Classroom Use

After placing an order, please wait for download and registration information to be emailed to you. This will allow you to download a registerable version and register it.

Upgrade an Existing License

If you're already a registered CSE HTML Validator user and your name and email is in our registered user database, then you can buy an upgrade to the latest version, upgrade your edition, or add priority support and maintenance (PS&M) to your license.

The upgrade page will show you what upgrades are available to you. You will need the email address that is in our database (this is usually the one that you registered with).

Buy Upgrade

Please Note
  • Printed invoices are not mailed to you. You should receive an invoice by email which you can then print and use as a printed invoice.
  • Your purchase is backed by our 30-day money back guarantee.
  • Please let us know if you have a buying question.

Buy Online

Buying online using a credit card is considered the fastest, cheapest, safest, and easiest way to buy and receive a registration key.

For Purchase orders: Contact us to buy using a purchase order (minimum $1000). There may be an additional processing fee. Be sure to indicate the quantity and edition desired. Alternatively, a reseller listed below may be able to process a purchase order with a reduced minimum requirement.

Problem with Your Order?

For buying questions, problems encountered while trying to buy, or any other question, please contact us. You may also call us in the US at 940-295-4720. However, it is recommended that you contact us electronically for any questions that you may have.

Support Contracts

Priority email and phone support contracts for CSE HTML Validator Pro and Enterprise are available. Please contact us if you have a question about support contracts.

Government Information

Some government agencies, including US government agencies, have purchased CSE HTML Validator licenses and are clients of ours. US Government agencies may be interested in CSE HTML Validator's Section 508 VPAT (PDF). Please contact us if you have any questions about government purchasing and licensing.

AI Internet Solutions LLC is classified by the US gov't as a small business.


Our primary reseller that processes payments for most purchases is BlueSnap. Below is additional address, contact, and tax information for BlueSnap:

BlueSnap, Inc. 800 South Street, Suite 640 Waltham, MA 02453 USA Voice: 1-866-312-7733 Fax: 1-858-777-5553 Tax ID: 45-0479415 Vat ID: EU826002156

Other Resellers

Regardless of where you are, you can buy from AI Internet Solutions over the Internet using the above links. Or, if you prefer, you can buy from a software reseller such as the ones listed below.