openCanvas event data
File type: Various data file
An oc4 file contains event data created by openCanvas, a drawing program.
The file stores the drawing actions or events used by openCanvas rather than a conventional standalone image.
File type category:
Various data file
Date updated: October 7, 2026
The oc4 file extension is associated with openCanvas, a drawing program developed by PGN for Apple macOS and Mac OS X.
An oc4 file contains event data from openCanvas version 4. It belongs to the software's working data and records information about the drawing process for use within openCanvas.
Because the format is tied to a specific openCanvas version, it is mainly useful when working with the corresponding software. It is not intended as a general-purpose image format.
Open the oc4 file with openCanvas on Apple macOS or Mac OS X. Use the version of openCanvas that supports version 4 event data, if available.
If the file does not open, it may require the original openCanvas version or may no longer be supported by newer releases.
Open the oc4 file in a compatible version of openCanvas and export or save the resulting artwork in an image format supported by that program.
Software apps that create oc4 files:
Apple macOS / Mac OS X
Software applications that handle other tasks involving oc4 files:
Apple macOS / Mac OS X
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