WAtom (Web standard)
WComputable Document Format
WCSS
WDevice independent file format
WDigital Accessible Information System
WDocument Freedom Day
WEPUB
WExtensible Metadata Platform
WFLAC
WFree Lossless Image Format
WGerber format
WGIF
WHTML
WJPEG
WJPEG 2000
WJSON
WLaTeX
WList of Digital Accessible Information System software
WMarkdown
WOgg
WOMG standard
WOpen Game Engine Exchange
WOpus (audio format)
WPlain text
WPortable Network Graphics
WProgressive Graphics File
WRSS
WScalable Vector Graphics
WSEG-Y
WShapefile
WShort Payment Descriptor
WSynchronized Multimedia Integration Language
WTent (protocol)
WVRML
WWebM
WWebP
WXML log
WZIM (file format)