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NAT Converter
Batch convert NAT files with the same settings across a whole project, from a handful of layers to an archive of tiles.
How to Convert .nat Images in Bulk
1. Install reaConverter
2. Select NAT Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless NAT 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 NAT 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
NAT images: Frequently Asked Questions
What are NAT files?
NAT (MSG Level 1.5 Native Format) is a binary container for the images of the SEVIRI instrument of Meteosat Second Generation. The file is divided into a header, a body of image lines, and a trailer. The header and trailer carry details that are known at the start and the end of the scan, such as the orbit and calibration data and the positions of the image areas, and the structure is self-describing, so a program can interpret it without outside tables. In the body, each group of lines holds one scan line for each of the 12 channels, with three lines for the high-resolution visible channel and one for each of the others, and this group is repeated about 3712 times for a full disk image. Pixels carry 10 bits, packed one after another, and the nominal image size for all channels except the high-resolution one is 3712 by 3712 pixels. A linear relation, with a slope and an offset stored in the header, converts the counts to radiance, which can then be turned into reflectance or brightness temperature. To convert such a file to graphics, a program unpacks the 10-bit values, calibrates them, and builds an image of one channel as grayscale or of three channels as an RGB composite, for example natural color or dust and fog composites. The result can be saved as PNG, JPEG, TIFF, or GeoTIFF with the geostationary projection.
Can reaConverter open NAT files?
reaConverter fully supports the NAT image format – open, edit, and export NAT files to any other popular file format with ease.
Do I need QGIS or ArcGIS to convert NAT files?
No. reaConverter reads NAT 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 NAT to another format?
reaConverter is a user-friendly tool for converting NAT files. Once installed on your computer, it allows you to convert all your .nat files at once with just a few clicks. You can even convert nat 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 NAT online?
If you only want to convert a few NAT images, you are welcome to try our free online NAT converter.
How can I turn NAT files on my computer to another format?
The best way to convert NAT 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 NAT.
How can I automate NAT 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 NAT 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 nat converter.
What else can I do with reaConverter?
Convert GIS filesConvert PDF filesAdd text on photosConvert RAW filesConvert DICOM files
What formats can I convert a NAT file to?
Discover More
Beyond NAT conversion
Convert .nat 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.
