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GRB Converter
Fast GRB conversion for Windows. reaConverter processes large batches reliably, without crashes or timeouts.
How to Convert .grb Files in Bulk
1. Install reaConverter
2. Select GRB Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless GRB 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 GRB 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 June 30, 2026
Questions & Answers
GRB files: Frequently Asked Questions
What are GRB files?
GRB is a raster image format associated with two calculator models produced by Hewlett Packard in the 1990s: the HP 48 and the HP 49. Both could be used for advanced algebraic operations and calculations and were considered innovative at the time of their release. GRB images most likely contain screen caps or other type of data connected to these devices. They are rare and difficult to open with regular image viewers.
Can reaConverter open GRB files?
reaConverter fully supports the GRB file format – open, edit, and export GRB files to any other popular file format with ease.
How do I change GRB to another format?
reaConverter is a user-friendly tool for converting GRB files. Once installed on your computer, it allows you to convert all your .grb files at once with just a few clicks. You can even convert grb images directly from Windows Explorer using the right-click menu — fast and convenient.
Can I convert GRB online?
If you only want to convert a few GRB files, you are welcome to try our free online GRB converter.
How can I turn GRB files on my computer to another format?
The best way to convert GRB 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 GRB.
How can I automate GRB 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 GRB 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 grb converter.
What else can I do with reaConverter?
Convert RAW formatsConvert GIS filesConvert PDFAdd text on picturesConvert CAD formats
What formats can I convert a GRB file to?
Discover More
Beyond GRB conversion
Convert .grb files in batches of any size, with editing and processing applied along the way. The same tool also handles 700+ other formats, including CAD, medical imaging, and GIS.
