Convert EF3 to CAL

Why upload sensitive EF3 files to online converters? reaConverter processes everything locally — convert to CAL with zero cloud risk.

Batch EF3 to CAL conversion doesn't have to be complicated. reaConverter processes entire folders with consistent quality settings. Works offline with no internet required — convert anywhere, anytime.

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EF3 to CAL
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How to Convert Multiple EF3 Files to CAL?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting EF3 files in under two minutes.

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Install reaConverter

2. Load your EF3 files

Open reaConverter and import your .ef3 files. No file limits, no slowdowns. Add as many as you need.

Drag files into the window, use the Add Files button, or select entire folders.

Load your EF3 files into reaConverter

3. Select CAL as output format

Select CAL as target format and pick where to save results. You can keep default settings or fine-tune the output.

Select CAL as output format

4. Start EF3 to CAL conversion

Hit Convert to process your files. The log window shows progress, timing, and status for every file.

Start Conversion

Conversion complete? Your CAL files are saved to the destination folder, ready to use.

EF3 to CAL Converter

reaConverter offers the fastest, simplest solution for converting your EF3 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 EF3 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
"We deployed reaConverter across our department to standardize file formats for our archives. The command-line support and automation features integrated perfectly into our systems. Stellar performance and zero crashes—it just works."
David R.
David R.
IT Solutions Architect
"So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!"
Kenneth D. Carter
Kenneth D. Carter
Satisfied Customer
"I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!"
Mark T.
Mark T.
Satisfied Customer

EF3 to CAL Conversion: FAQ

What are EF3 files?

EF3 is a format associated with fax machines manufactured by Everex under the Everfax brand, which was fairly popular in the late 1980s. EF3 files contain images of sent and received documents and might be difficult to open using regular image viewers. Everex was well known as a manufacturer of tape drives, graphic boards, DTP products and other computer devices throughout the 1980s, but its success decreased in time. After filing for bankruptcy, the company was acquired by New Market Technology in 2008 and now continues to produce desktop computers and notebooks.

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 EF3 to CAL?

Yes! reaConverter instantly converts .ef3 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 EF3 to CAL online?

If you only need to convert a few EF3 files to CAL format, feel free to try our free online free online EF3 to CAL converter — perfect for small batches with no installation needed!

How can I turn EF3 files into CAL on my computer?

The best way to change EF3s 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 EF3 to CAL.

How can I automate EF3 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 EF3 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 ef3 to cal converter for batch processing.

What else can I do with reaConverter?

Convert GIS filesConvert RAW photosConvert DICOM filesResize picturesChange format settings

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