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GEN Converter
GEN conversion on your own PC. No account, no subscription, no per-file quota, and nothing leaves the machine.
How to Convert .gen Files in Bulk
1. Install reaConverter
2. Select GEN Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless GEN 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.
GIS Toolkit
Do more with your GIS data
Need GEN data as something anyone can open? reaConverter renders imagery and elevation grids into standard images and documents without QGIS or ArcGIS, and works through whole folders in one pass.
- Render imagery, elevation grids and scanned charts to TIFF, PNG, JPG or PDF
- Resize, crop and set DPI on the output in the same run
- Bring tiles, scenes and grids from many sources into one consistent format
- Convert incoming survey and field data automatically with Watch Folders
- Script GIS conversions from the command line for pipelines and scheduled jobs
- Keep cadastral, utility and client data on your PC: nothing is uploaded
User reviews
From those who tried it
Average User Rating:Last updated on July 28, 2026
Questions & Answers
GEN files: Frequently Asked Questions
What are GEN files?
GEN (ADRG General Information File) is the main entry point of an ARC Digitized Raster Graphics dataset, a military format for scanned maps and charts. The format follows the ISO 8211 standard, in which an ASCII description of the data is followed by binary content. The .gen file carries the image parameters and support data and lists the names of the .img files, which hold the pixels of each zone distribution rectangle, while the optional .thf transmittal header file describes the whole delivery and can reference more than one image. Datasets are divided into Distribution Rectangles and use the ARC projection, which splits the earth into 18 latitude zones, so each zone has its own geometry and image file. The images are color pictures with 8 bits per channel for red, green, and blue. To convert to graphics, a program reads the .gen file first, then loads the matching .img files, assembles the image, and assigns the coordinates from the zone parameters. The result can be saved as PNG, JPEG, TIFF, or GeoTIFF. Extra images with legends and insets from the paper chart may also be present. Supported by FME, Manifold GIS, and LuciadLightspeed.
Can reaConverter open GEN files?
reaConverter fully supports the GEN file format – open, edit, and export GEN files to any other popular file format with ease.
Do I need QGIS or ArcGIS to convert GEN files?
No. reaConverter reads GEN files on its own, so the conversion needs no GIS installation and no licence. It handles whole folders at once, which suits survey archives, tile sets and data deliveries that have to reach people working in other software.
How do I change GEN to another format?
reaConverter is a user-friendly tool for converting GEN files. Once installed on your computer, it allows you to convert all your .gen files at once with just a few clicks. You can even convert gen images directly from Windows Explorer using the right-click menu — fast and convenient.
Why choose offline conversion with reaConverter?
Keep your sensitive data 100% private with offline processing that never exposes files to cloud risks. Our software meets strict compliance standards (GDPR, HIPAA, CCPA) while handling confidential documents for legal, healthcare and financial sectors.
Can I convert GEN online?
If you only want to convert a few GEN files, you are welcome to try our free online GEN converter.
How can I turn GEN files on my computer to another format?
The best way to convert GEN 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 GEN.
How can I automate GEN 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 GEN 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 gen converter.
What else can I do with reaConverter?
Convert GIS filesVectorize imagesChange bit depthChange format settingsCopy metadata (EXIF, IPTC)
What formats can I convert a GEN file to?
Discover More
Beyond GEN conversion
Convert .gen files in batches of any size, with editing and processing applied along the way. The same tool also handles 800+ other formats, including CAD, medical imaging, and GIS.
