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Doodle C64 Compressed image format
File type: Bitmap image file
Files with jj file extension could in the past be found as drawings made in Doodle program on Commodore 64.
Found 2 different file type records with the same jj filename suffix.
File type category:
Bitmap image file
Date updated: June 23, 2025
Record marked as obsolete and not updated for a long time.
The jj file extension was in the past used for a special compressed image format used on Doodle program for Commodore 64.
Doodle was a popular graphics editor on that platform.
You should be able to view these files using XnView.
Use XnView to export *.jj files to other formats.
File type category:
Various data file
Date updated: September 7, 2017
The jj file extension is mainly associated with the JavaCC (Java Compiler Compiler) a parser generator for use with Java applications.
The jj file stores various data used for internal purposes of the Java Compiler Compiler.
It does not seem likely that you can manually open or otherwise access this type of .jj files.
As far as we know, conversion for .jj file is not possible.
Software applications that handle other tasks involving jj files:
Multiplatform
Language
