Interoperable interactive geometry for Europe
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This platform is brought to you by the intergeo project, funded under the eContent Plus programme of the European commission and by partners

About the I2G File Format

This is the page of the I2G file format, which allows different Dynamic Geometry Systems to share construction files. This format will allow soon enough your favourite DGS to play educational resources originally written for other software systems.

The technical details of the format can be found here. Also, looking at some examples may be helpful, you can get the XML schema here. If you are already familiar with the format and want to consult the most recent documentation, you might want to go to the File Format Symbols page. If you are searching for something else related to the file format, see the complete list of pages related to the format.

The I2G File Format is still in development. We have a wish list containing ideas to be considered. Of course, implementations of the format are also in development; you can see the current status of several DGS at the implementations table.

Last news:

  • The extension of our files, .i2g, is already a MIME type.
  • The Intergeo ABSL has been created, so that the I2G File Format will be maintained after the Intergeo Project ends.
  • Deliverable D3.10 was released in July 2010.
  • Now we have vectors and polygons.


We have a growing test suite to validate implementations of the format; it's in the SVN server, at

How to test an example on a system:


The pages of the symbols contain links to these examples that can be played online using JSXGraph; for instance, in the line_through_two_points page you can see the source and JSXGraph displaying of a very simple example using this constraint.