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CALS Converter
Fast CALS conversion for Windows. reaConverter processes large batches reliably, without crashes or timeouts.
How to Convert .cals Images in Bulk
1. Install reaConverter
2. Select CALS Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless CALS 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.
Edit & Enhance
Do more with your images
Converting CALS images for use in a workflow? Touch up, transform, apply editing and effects to your images during conversion.
Our range of editing options includes such image processing actions as Resize, Rotate, Crop, Color Replace, Watermarks and more. Adjust actions include RGB, HLS, HSV, Brightness and Contrast. Auto-processing options are also available, such as auto-rotate and auto-crop.
User reviews
From those who tried it
Average User Rating:Last updated on June 28, 2026
Questions & Answers
CALS images: Frequently Asked Questions
What are CALS files?
CALS Raster file format is a standard file format used specifically for storing and exchanging black-and-white images that are created using computer-aided design (CAD) or document imaging systems. It was originally developed by the US Department of Defense as part of the Computer-Aided Acquisition and Logistics Support (CALS) initiative, which aimed to standardize the creation and sharing of technical data across different computer systems. CALS Raster files have a .cal or .mil file extension and typically contain uncompressed monochrome bitmap images. They are commonly used in industries such as defense, aerospace, and government, where precise technical drawings and diagrams need to be exchanged between different organizations and computer systems.
Can reaConverter open CALS files?
reaConverter fully supports the CALS image format – open, edit, and export CALS files to any other popular file format with ease.
How do I change CALS to another format?
reaConverter is a user-friendly tool for converting CALS files. Once installed on your computer, it allows you to convert all your .cals files at once with just a few clicks. You can even convert cals images directly from Windows Explorer using the right-click menu — fast and convenient.
Can I convert CALS online?
If you only want to convert a few CALS images, you are welcome to try our free online CALS converter.
How can I turn CALS files on my computer to another format?
The best way to convert CALS images 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 CALS.
How can I automate CALS 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 CALS 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 cals converter.
What else can I do with reaConverter?
Convert RAW formatsConvert GIS filesConvert CAD formatsSet file dateConvert PDF
What formats can I convert a CALS file to?
Discover More
Beyond CALS conversion
Convert .cals 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.
