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keywords=HTML, HyperText Markup Language, Validation, W3C Markup Validation Service;
description=W3C s easy-to-use markup validation service, based on SGML and XML parsers.;

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the w3c markup validation service markup validation service check the markup html xhtml of web documents validate by uri validate by file upload validate by direct input validate by uri validate a document online address more options character encoding detect automatically utf 8 unicode worldwide utf 16 unicode worldwide iso 8859 1 western europe iso 8859 2 central europe iso 8859 3 southern europe iso 8859 4 north european iso 8859 5 cyrillic iso 8859 6 i arabic iso 8859 7 greek iso 8859 8 hebrew visual iso 8859 8 i hebrew logical iso 8859 9 turkish iso 8859 10 latin 6 iso 8859 11 latin thai iso 8859 13 latin 7 baltic rim iso 8859 14 latin 8 celtic iso 8859 15 latin 9 iso 8859 16 latin 10 us ascii basic english euc jp japanese unix shift_jis japanese win mac iso 2022 jp japanese email euc kr korean ksc_5601 korean gb2312 chinese simplified gb18030 chinese simplified big5 chinese traditional big5 hkscs chinese hong kong tis 620 thai koi8 r russian koi8 u ukrainian iso ir 111 cyrillic koi 8 macintosh macroman windows 1250 central europe windows 1251 cyrillic windows 1252 western europe windows 1253 greek windows 1254 turkish windows 1255 hebrew windows 1256 arabic windows 1257 baltic rim only if missing document type detect automatically html5 experimental xhtml 1 0 strict xhtml 1 0 transitional xhtml 1 0 frameset html 4 01 strict html 4 01 transitional html 4 01 frameset html 4 01 rdfa 1 1 html 3 2 html 2 0 iso iec 15445 2000 iso html xhtml 1 1 xhtml rdfa xhtml basic 1 0 xhtml basic 1 1 xhtml mobile profile 1 2 xhtml print 1 0 xhtml 1 1 plus mathml 2 0 xhtml 1 1 plus mathml 2 0 plus svg 1 1 mathml 2 0 svg 1 0 svg 1 1 svg 1 1 tiny svg 1 1 basic smil 1 0 smil 2 0 only if missing list messages sequentially group error messages by type show source clean up markup with html tidy show outline validate error pages verbose output validate by file upload upload a document for validation file more options character encoding detect automatically utf 8 unicode worldwide utf 16 unicode worldwide iso 8859 1 western europe iso 8859 2 central europe iso 8859 3 southern europe iso 8859 4 north european iso 8859 5 cyrillic iso 8859 6 i arabic iso 8859 7 greek iso 8859 8 hebrew visual iso 8859 8 i hebrew logical iso 8859 9 turkish iso 8859 10 latin 6 iso 8859 11 latin thai iso 8859 13 latin 7 baltic rim iso 8859 14 latin 8 celtic iso 8859 15 latin 9 iso 8859 16 latin 10 us ascii basic english euc jp japanese unix shift_jis japanese win mac iso 2022 jp japanese email euc kr korean ksc_5601 korean gb2312 chinese simplified gb18030 chinese simplified big5 chinese traditional big5 hkscs chinese hong kong tis 620 thai koi8 r russian koi8 u ukrainian iso ir 111 cyrillic koi 8 macintosh macroman windows 1250 central europe windows 1251 cyrillic windows 1252 western europe windows 1253 greek windows 1254 turkish windows 1255 hebrew windows 1256 arabic windows 1257 baltic rim only if missing document type detect automatically html5 experimental xhtml 1 0 strict xhtml 1 0 transitional xhtml 1 0 frameset html 4 01 strict html 4 01 transitional html 4 01 frameset html 4 01 rdfa 1 1 html 3 2 html 2 0 iso iec 15445 2000 iso html xhtml 1 1 xhtml rdfa xhtml basic 1 0 xhtml basic 1 1 xhtml mobile profile 1 2 xhtml print 1 0 xhtml 1 1 plus mathml 2 0 xhtml 1 1 plus mathml 2 0 plus svg 1 1 mathml 2 0 svg 1 0 svg 1 1 svg 1 1 tiny svg 1 1 basic smil 1 0 smil 2 0 only if missing list messages sequentially group error messages by type show source clean up markup with html tidy show outline validate error pages verbose output note file upload may not work with internet explorer on some versions of windows xp service pack 2 see our information page on the w3c qa website validate by direct input enter the markup to validate more options validate full document use doctype detect automatically html5 experimental xhtml 1 0 strict xhtml 1 0 transitional xhtml 1 0 frameset html 4 01 strict html 4 01 transitional html 4 01 frameset html 4 01 rdfa 1 1 html 3 2 html 2 0 iso iec 15445 2000 iso html xhtml 1 1 xhtml rdfa xhtml basic 1 0 xhtml basic 1 1 xhtml mobile profile 1 2 xhtml print 1 0 xhtml 1 1 plus mathml 2 0 xhtml 1 1 plus mathml 2 0 plus svg 1 1 mathml 2 0 svg 1 0 svg 1 1 svg 1 1 tiny svg 1 1 basic smil 1 0 smil 2 0 only if doctype is missing validate html fragment use doctype html 4 01 xhtml 1 0 list messages sequentially group error messages by type show source clean up markup with html tidy show outline validate error pages verbose output this validator checks the markup validity of web documents in html xhtml smil mathml etc if you wish to validate specific content such as rss atom feeds or css stylesheets mobileok content or to find broken links there are other validators and tools available as an alternative you can also try our non dtd based validator home about news docs help faq feedback contribute this service runs the w3c markup validator v 1 3 hg copyright 1994 2013 w3c mit ercim keio beihang all rights reserved w3c liability trademark 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