InkML is an XML - based markup language that enable data inputs are described by an electronic pen or stylus. The specification of a recommendation was adopted in September 2011 by the World Wide Web Consortium (W3C).

InkML is part of the W3C Multimodal Interaction Activity Initiative.


The aim of the InkML Toolkit ( InkMLTk ) is to provide a set of tools for working with InkML documents. The toolkit includes the following libraries and tools:

  • InkML processing libraries that implement the W3C specification InkML
  • Conversion libraries and tools ( to and from other Ink and image formats )
  • InkML Viewer as a browser plug-ins and
  • InkML applications, such as image editing programs

The project is provided as an open source contribution from HP Labs in India on SourceForge.