Validate by URI

Validate a document on the internet, local server or disk:

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Welcome to Validator S.A.C. - a stand-alone version of the W3C Markup Validator. This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.

Because Validator S.A.C. is a stand-alone application, it can validate local files, and pages on local servers. Validate using the stand-alone Favelet, drag and drop, or File > Open.

Validator S.A.C. can also be setup as a Web Service, allowing users to validate over the local network. See the Advanced Topics section for details.