Validators and Checkers
Don't forget to check out the Web Design Group's own validators and checkers in our Tools section.
- W3C MarkUp Validation Service
- Online HTML and XHTML validator.
- Validome
- Online HTML, XHTML, and XML validator available in German, English, French, and Russian.
- A Real Validator
- Shareware HTML validator for Windows; offline version of the WDG HTML Validator.
- Validator-Lite
- Free HTML and XHTML validator for Linux and other Unix-like systems.
- XML schema validator
- Checks XHTML 1.0 documents against XML schemas, with detection of
errors not found by other validators.
- SP
- James Clark's multi-platform SGML parser that includes the SGML validator nsgmls.
- HTML TIDY
- Dave Raggett's free cross-platform utility for cleaning up HTML.
- BBEdit
- Shareware text and HTML editor for the Macintosh that includes an HTML validator.
- STG XML Validation Form
- Syntax validator for XML documents.
- Web Page Backward Compatibility Viewer
- Allows authors to view a page with selected tags unsupported--a good tool for ensuring cross-browser compatibility.
- Web Page Purifier
- Allows authors to view a page "purified" to be compliant with HTML 2.0, HTML 2.0+Tables, HTML 3.2, or webtv 1.1.
- W3C CSS Validation Service
- A free, easy-to-use CSS checker.
- W3C Link Checker
- A free, easy-to-use link checker.
- HTML Validator for Firefox and Mozilla
- Mozilla extension for checking pages in Firefox and Mozilla using Tidy or OpenSP.
- LinkAlarm
- Fee-based service that regularly checks a site's links and sends a report by e-mail.
- NetMechanic
- Link tester and HTML lint that scans a site and sends a report by e-mail.
- HTML PowerTools
- Shareware Windows program that includes an offline link checker and a configurable quasi-validator.
- CyberSpyder Link Test
- Shareware Windows program to check the validity of hyperlinks.
- LinkScan
- Server-based link checker for UNIX and Windows NT.
- Robots.txt Checker
- Online checker for robots.txt syntax.
- Web Link Validator
- Shareware link checker for Windows.
- UITest.com resources
- A good collection of links to validators, accessibility checkers, and more.
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