Convert TNL to CG4

TNL to CG4 made simple. Add files or folders, pick your settings, click Convert. reaConverter handles the rest — even thousands of files.

Batch TNL to CG4 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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TNL to CG4
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How to Convert Multiple TNL Files to CG4?

1. Download and Install reaConverter

First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed.

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Install reaConverter

2. Load your TNL files

Load your TNL files into reaConverter. You can add individual files or point to folders, and the software will queue everything automatically.

Select TNLs from a folder or drag-and-drop them directly into the reaConverter window.

Load your TNL files into reaConverter

3. Select CG4 as output format

Choose CG4 for output and set your save location. reaConverter lets you customize quality and apply edits before conversion.

Select CG4 as output format

4. Start TNL to CG4 conversion

Press the Convert button and reaConverter takes care of the rest. Processing time depends on file size and volume.

Start Conversion

After processing, find all your new .cg4 files in the output location. The log shows details for each conversion.

TNL to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your TNL files into CG4 in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting TNL 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 14, 2026
"reaConverter saved our team hundreds of hours by digitizing decades of CG4 archives in weeks—not months. Its resolution scaling preserved every detail, even in files older than some team members!"
Anna K.
Anna K.
Satisfied Customer
"The step-by-step video makes conversion foolproof. I'd recommend this to my grandma - it's that well-explained!"
DeShawn M. Thompson
DeShawn M. Thompson
Happy User
"I'm really impressed with this software - it converts files between formats incredibly fast!"
Lin Zhang
Lin Zhang
Happy User
"I firmly believe working with JPEG — the universal format supported by all devices and apps—is the wisest choice. reaConverter handles these conversions flawlessly."
Ava Thomas
Ava Thomas
Happy User
"Your solution was buried deeper in search results than it should be. After struggling with unclear alternatives, I found your guides — finally, instructions that made sense for a first-time user like me. Excellent work!"
Richard E. Miller
Richard E. Miller
Satisfied Customer
"Converts files in seconds! Finally a tool that's both fast and simple to use."
Wei Chen
Wei Chen
Happy User

TNL to CG4 Conversion: FAQ

What are TNL files?

TNL is an obsolete image format storing thumbnail images. It is considered rare and probably difficult to open using regular image viewers. Conversion to more popular formats might be the best way to access TNL files.

What are CG4 files?

CG4 is a raster format associated with CALS (Continuous Acquisition and Life-Cycle Support) — a program initiated by the US Department of Defense to capture and link military data. CG4 is compatible with a very limited number of digital graphics programs. Files with this extension contain a bitmap that often uses the CCITT4 compression, which is an old fax machine standard used for black-and-white images.

Can reaConverter convert TNL to CG4?

Yes! reaConverter instantly converts .tnl to .cg4 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 TNL to CG4 online?

If you only need to convert a few TNL files to CG4 format, feel free to try our free online free online TNL to CG4 converter — perfect for small batches with no installation needed!

How can I turn TNL files into CG4 on my computer?

The best way to change TNLs to CG4s 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 TNL to CG4.

How can I automate TNL to CG4 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 TNL files to CG4 using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line tnl to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert CAD formatsSet picture bit depthConvert Gerber imagesCrop fileSet file date

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