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About W3C Markup Validation Service
The W3C Markup Validation Service checks web documents written in HTML, XHTML and related formats against their specifications. You can validate a page by URL, by uploading a file or by pasting markup directly.
Options let you set the character encoding, with a long list covering many languages, and the document type, or leave both to automatic detection. HTML5 support in this checker is marked experimental; the W3C's Nu Html Checker is a separate tool aimed at modern HTML.
Strengths
- Validate by URL, file upload or direct input
- Choice of character encoding and document type
- Documented help for interpreting results
Limitations
- HTML5 validation is marked experimental
- Modern HTML is better served by the separate Nu Html Checker
Details
- Pricing
- FreeA free service run by the W3C.
- License
- Proprietary
- Developer
- W3C
- Platforms
- Web
- How it runs
- Web application
- Account
- Not required
- Works offline
- No
- Best suited for
- Checking HTML and XHTML documents against W3C specifications
- Categories
- Developer tools, Website testing
- Last verified
- Added
- Provenance
- Selected from the TechWalrus Resource Hub (Website Checkers & Audit Tools); facts checked against the developer's own pages, 2 sources on file.