JJ Converter

Offline JJ converter with professional output. reaConverter keeps your files secure while you work.

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reaConverter
Convert
JJ Files
Online

How to Convert .jj Files in Bulk

1. Install reaConverter

Download reliable JJ conversion software to convert multiple .jj files and folders in one go.
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Install reaConverter

2. Select JJ Files

Select JJs from a folder or drag and drop them into reaConverter, then choose the desired output format.
reaConverter - Load JJ files

3. Start Conversion

Click Convert to start the bulk conversion of all selected JJ files. The process will begin right away.
reaConverter - Start JJ conversion

Convert JJ on your PC

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.

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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.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on November 29, 2025
"I'm really impressed with this software - it converts files between formats incredibly fast!"
Lin Zhang
Lin Zhang
Happy User
"The step-by-step video makes conversion foolproof. I'd recommend this to my grandma - it's that well-explained!"
DeShawn M. Thompson
DeShawn M. Thompson
Happy User
"We receive artwork in all kinds of formats from clients. reaConverter takes care of converting them all to print-ready specs automatically using Watch Folders. It reduces errors, saves us time, and has improved our turnaround time with customers. Incredibly powerful software."
Michael D.
Michael D.
Print Shop Owner
"Rare software that actually does it all! Converts anything, beautiful interface, and never lets me down. A must-have!"
Henry R.
Henry R.
Happy User
"My photography business relies on fast, accurate processing of images. With reaConverter’s Watch Folder, I drop my RAW photos into a folder and they’re instantly converted to high-res JPEGs with custom naming and watermarking. It’s streamlined my post-processing more than I imagined possible."
Emily R.
Emily R.
Photographer
"An excellent program! I use it regularly in my work - it supports nearly every file format imaginable. The interface is intuitive and runs flawlessly every time."
Roger Cook
Roger Cook
Happy User

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 images 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?

Copy EXIF dataConvert GIS filesConvert CAD formatsSet picture bit depthChange format settings

What formats can I convert a JJ file to?
ai  apng  avif  bmp  bpg  cal  cg4  cgm  cin  dcx  dds  dgn  dis  drw  dwf  dwg  dxf  emf  epi  eps  fax  fits  flif  gbr  gif  hpg  hru  ico  iff  iges  igs  jp2  jpeg  jpg  jxl  jxr  mif  mtv  pcl  pct  pcx  pdf  pgm  pic  plt  png  ppm  prc  ps  psd  qoi  qrt  rad  rla  sgi  shp  svg  svgz  tga  tif  tiff  webp  webpll  wmf  wmz  wpg  wrl  xbm  xpm 

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Explore our efficient JJ file converter that saves you time and effort by converting multiple .jj files into different formats.
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