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) windows-1251 (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) windows-1251 (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 service runs the W3C Markup Validator, v1.2.

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