Reference:File Format
Accessing GeoGebra files
A GeoGebra file is ending with .ggb
(GeoGebra worksheet) or .ggt
(GeoGebra tool), which are both just renamed .zip
files. You can easily open them with a ZIP program of your choice by renaming them to .zip and open them as you would open any .zip
file.
Contents
.ggb - GeoGebra Worksheet
The .ggb
file is the standard way to save GeoGebra worksheets. As stated above this file is just a renamed .zip
file. If you rename your .ggb
to .zip
you will find the following files after unzipping:
geogebra.xml
This is the file in which all the information about the construction is stored, the information is stored in XML. For more information about the contents and structure of this file see the XML reference.
geogebra_thumbnail.png
This image contains a small preview image of the construction saved in the geogebra.xml
. GeoGebra itself uses this image for the preview of GeoGebra files in the "Open.." and "Save As.." Dialog. This thumbnail could also be used to display previews of GeoGebra files within the operating systems file explorer or could be used by online systems or any other kind of software to display previews of uploaded GeoGebra files.
geogebra.js
This file contains global JavaScript definitions used in the file. See Scripting for details.
images
Images used in the construction (included using the GeoGebra Image Tool) or as icons of custom tools are not stored with human-readable filenames, but can easily copied and renamed to be extracted out of GeoGebra files. If there are no images or custom tools in the .ggb
there will be just the geogebra.xml
and geogebra_thumbnail.png
in the .ggb
.
.ggt - GeoGebra Tool
The .ggt
files use the same technique for storage as the .ggb
files, so renaming and unzipping will reveal the following files:
geogebra_macro.xml
This XML stores the main information about the tool. As custom tools are also stored in the normal .ggb
files the structure of the entries in this files are also explained in the XML reference.
images
If there is any special icon assigned to this tool this icon is stored in a sub-folder. Be aware that both the icon and the sub-folder have names not intended to be read by humans, so don't try to make some sense out of it.
Modifying the files
Modifying .ggb
or .ggt
files (namely the .xml
files within them) is clearly a task for the most tech-savvy users of GeoGebra. Whether you want to touch the .xml
because you want to modify something which can't be modified by GeoGebra at the moment, like the definition of a custom tool, or you want to trick GeoGebra or just experiment you should take some tips for your journey:
- Backup your files. It's almost certain that you will break your files sometime if you're modifying the XML definition.
- Read the XML reference to understand what you are doing.
- Be aware that the changes you've made may be lost if you re-save your file within GeoGebra. While it might be possible that GeoGebra understands something unusual while loading it might not save it at all or save it somehow anormal which corrupts the file.
- ZIP all required files at the end using the most standard ZIP options (no encryption etc.) and rename your files back to
.ggb
.
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