W3C Markup Validation Service icon
W3C Markup Validation Service icon

W3C Markup Validation Service

Validates HTML markup of web pages, one at a time.

W3C Markup Validation Service screenshot 1

Cost / License

  • Free
  • Open Source

Platforms

  • Online
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What is W3C Markup Validation Service?

W3C's easy-to-use markup validation service, based on SGML and XML parsers.