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PRJ Converter
Convert PRJ to other 3D formats, or render it to images and 2D drawings. reaConverter handles whole folders offline.
How to Convert .prj Files in Bulk
1. Install reaConverter
2. Select PRJ Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless PRJ 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.
3D Toolkit
Do more with your 3D models
From game assets to product models, reaConverter converts PRJ files to formats other tools can open, offline and in batch.
- Move models into STL for printing, STEP for CAD, or GLB and glTF for web viewers
- Save a turning model as an animated GIF for a product page or catalogue
- Script 3D conversions from the command line
User reviews
From those who tried it
Average User Rating:Last updated on July 26, 2026
Questions & Answers
PRJ files: Frequently Asked Questions
What are PRJ files?
The PRJ extension is attached to project files created with 3D Studio, the predecessor of 3ds Max, created for operation on the DOS platform. PRJ is also known as a mesh file, containing graphical data related to geometry, texture, lighting and other relevant info associated to a 3D model.
Can reaConverter open PRJ files?
reaConverter fully supports the PRJ file format – open, edit, and export PRJ files to any other popular file format with ease.
Do I need 3D or CAD software to convert PRJ files?
No. reaConverter reads PRJ files on its own, so the conversion needs no Blender, 3ds Max or Maya installation. It runs offline on your PC and handles whole folders at once, which suits model libraries, supplier deliveries and product ranges that have to reach people working in other software.
How do I change PRJ to another format?
reaConverter is a user-friendly tool for converting PRJ files. Once installed on your computer, it allows you to convert all your .prj files at once with just a few clicks. You can even convert PRJ models directly from Windows Explorer using the right-click menu — fast and convenient.
Can I convert PRJ online?
If you only want to convert a few PRJ files, you are welcome to try our free online PRJ converter.
How can I turn PRJ files on my computer to another format?
The best way to convert PRJ 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 PRJ.
How can I automate PRJ 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 PRJ 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 prj converter.
What else can I do with reaConverter?
Convert Gerber filesConvert picture color spaceConvert DICOM filesCrop picturesConvert vector files
What formats can I convert a PRJ file to?
Discover More
Beyond PRJ conversion
Convert .prj 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.
