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JJ Converter
Offline JJ converter with professional output. reaConverter keeps your files on your machine while you work.
How to Convert .jj Files in Bulk
1. Install reaConverter
2. Select JJ Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless JJ file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.
Extra Tools
Do more with your files
Converting JJ files for use in a larger project? reaConverter offers many ways to process files, so you can customize them according to your requirements.
Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.
User reviews
From those who tried it
Average User Rating:Last updated on July 30, 2026
Questions & Answers
JJ files: Frequently Asked Questions
What are JJ files?
JJ is a compressed image format associated with Doodle, a graphics editing software program that used to work on Commodore 64 computers. This was one of the first brands of home computers to gain wide popularity and it was sold extensively during the 1980s. At the current moment, JJ is considered an obsolete and rare format.
Can reaConverter open JJ files?
reaConverter fully supports the JJ file format – open, edit, and export JJ files to any other popular file format with ease.
How do I change JJ to another format?
reaConverter is a user-friendly tool for converting JJ files. Once installed on your computer, it allows you to convert all your .jj files at once with just a few clicks. You can even convert JJ files directly from Windows Explorer using the right-click menu — fast and convenient.
Can I convert JJ online?
If you only want to convert a few JJ files, you are welcome to try our free online JJ converter.
How can I turn JJ files on my computer to another format?
The best way to convert JJ files on your PC is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from JJ.
How can I automate JJ files conversion?
reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.
Can I convert JJ files using scripts or the command-line interface?
reaConverter provides full access to all its features from the Windows command-line shell, including the command-line jj converter.
What else can I do with reaConverter?
Convert GIS filesConvert microscopy filesImage resizerConvert CAD formatsSet file date
What formats can I convert a JJ file to?
Discover More
Beyond JJ conversion
Convert .jj files in batches of any size, with editing and processing applied along the way. The same tool also handles 800+ other formats, including CAD, medical imaging, and GIS.
