File Formats in Grapher: GPJ, GRF, and GRT files

Grapher saves project files in three formats: GRF, GPJ, and GRT files. You can choose which extension is used when saving, or after clicking File | Save as and changing the Save as type to your desired file type. An explanation of each file type is provided below.


Grapher GRF Files (Grapher’s default file type)

Grapher GRF files contain all information necessary to reproduce the graph, except for your data. When you save a Grapher file (GRF), Grapher retains all scaling, formatting, and parameters for the graph within the file. GRF files save a link to the data and do not store the data internally in the file.

If you share a GRF file, you will also need to share the data file(s) used to create the graph, in addition the your GRF file. Use this format if your data often changes, or if you need to link to an external data source.


Grapher GPJ Project Files (embeds worksheet data)

Grapher GPJ files store all the information necessary to reproduce the graph, including embedded worksheet data. All scaling, formatting, and parameters for the graph are preserved in the file.

If you share a GPJ file, you do not need share your data files, as this file format retains this formation. GPJ format is best used to contain your plot and worksheet data in a single file, and when the data does not change often. If your worksheet data changes, you will need to manually update your GPJ file.

Grapher GRT Template Files (creates templates with saved preferences)

Use Grapher GRT files to create templates with set graphing preferences. A saved template file does not refer to any specific data file. Once you create a template graph, you can use the template with any set of data. Use a template to set default graphing options such as the number of decimal places on axis tick mark labels, graph titles, fill colors, symbol size, and more.

If you share a GRT file, other users can use their own data sets with your file to create graphs based on your template specifications. Use Grapher’s GRT format when you need to maintain the layout of a graph while maintaining consistency with various similarly formatted data files.

Updated May 2023

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