The Free Site Validator service primarily checks two things. First, it crawls your site and discovers all of the publicly available pages within it and validates all of those pages against the W3C validator. Invalid pages are logged and the messages for each page are included in the custom report that is available when the crawler begins.

Secondly, each link that is encounted on every single page gets checked to ensure it is still "alive". This includes images, javascripts, style sheets, documents, etc. All broken links are also reported once the crawler starts.

There is no limit to the number of pages our crawler can crawl. However, if you have a large site, expect to wait a while for your report to complete. We also ask that, in order to keep this service free, you don't abuse the service by scheduling repeated reports, using it for unintended purposes, etc.