The Web Design Group


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.
Watchfire WebXACT
Checks HTML for accessibility.
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.
Watchfire WebQA
Link checker and site management tool for Windows.
MOMspider
Perl-based link checker and analyzer for Unix.
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.
Open Directory HTML Validators and Debuggers
A list of validation and checking links.