Convert C4 to CAL

Bulk C4 to CAL conversion with consistent results. Set it up once, process thousands of files with the same quality every time.

Tired of converting C4 files one at a time? reaConverter processes entire folders to CAL automatically. Handles large batches reliably without crashes or timeouts.

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How to Convert Multiple C4 Files to CAL?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting C4 files in under two minutes.

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Install reaConverter

2. Load your C4 files

Launch reaConverter and drop in your C4 files. The software queues everything for batch processing with consistent settings.

Add files by dragging them in, browsing folders, or using the right-click menu from Windows Explorer.

Load your C4 files into reaConverter

3. Select CAL as output format

Pick CAL as output format and choose the destination folder where you want to save new .cal files.

Select CAL as output format

4. Start C4 to CAL conversion

Then simply press the Convert button and your conversion will begin in no time!

Start Conversion

Once the conversion is complete, you can find your CAL files in the destination folder you selected.

C4 to CAL Converter

reaConverter offers the fastest, simplest solution for converting your C4 files into CAL in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting C4 files for use in a workflow? 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 January 25, 2026
"An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness."
Elena Anderson
Elena Anderson
Happy User
"Enable shell integration for lightning-fast file conversions directly from Windows Explorer."
R. Lewis
R. Lewis
Happy User
"After 200+ conversions on my budget laptop (i3-1115G4/4GB RAM/Win11), reaConverter outperforms heavyweight tools. Zero crashes, low CPU usage during batch processing, and no internet dependency - exactly what professionals need."
Walter Morgan
Walter Morgan
Satisfied Customer
"This software just works! My old laptop can’t handle Photoshop, but reaConverter flies through conversions without breaking a sweat. Wi-Fi gone? Still strong!"
Robert Williams
Robert Williams
Happy User
"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
"For cross-platform compatibility, JPEG remains the gold standard. reaConverter’s precision conversions ensure perfect results every time, whether for presentations, websites, or client deliverables."
Paul Baker
Paul Baker
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C4 to CAL Conversion: FAQ

What are C4 files?

A C4 file represents an Edmics or Jedmics bi-level raster image. Jedmics stands for "Joint Engineering Data Management Information and Control System" and represents an initiative of the US Department of Defense. C4 Jedmics files contain bitmap images intended for military use and are considered very rare files.

What are CAL files?

A CAL image file represents a monochrome bitmap image that uses the CALS raster image standard for storing graphics data. This standard was created in the 1980s by the US Department of Defence as a compressed interchangeable image format. CAL and CALS are extensions used for similar purposes.

Can reaConverter convert C4 to CAL?

Yes! reaConverter instantly converts .c4 to .cal with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert C4 to CAL online?

If you only need to convert a few C4 files to CAL format, feel free to try our free online free online C4 to CAL converter — perfect for small batches with no installation needed!

How can I turn C4 files into CAL on my computer?

The best way to change C4s to CALs on your PC is to install 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 C4 to CAL.

How can I automate C4 to CAL files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert C4 files to CAL using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line c4 to cal converter for batch processing.

What else can I do with reaConverter?

Convert GIS filesChange format settingsChange DPIConvert CAD formatsSet bit depth

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