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GRC Converter
Batch convert GRC files with the same settings across a whole project, from a handful of layers to an archive of tiles.
How to Convert .grc Files in Bulk
1. Install reaConverter
2. Select GRC Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless GRC 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 GRC 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
GRC files: Frequently Asked Questions
What are GRC files?
GRC (Northwood Classified Grid Format) is a raster format in which every cell holds a class code instead of a measured value. The file begins with a short header that identifies it as a classified grid, so programs can tell it from a numeric .grd file, and the header also stores the grid size, the location on the map, and a description of the coordinate system. Each cell takes one or two bytes, depending on the number of classes. Behind the grid, the file contains a table that links every code to a class name and a display color, and it can also contain optional relief shading. To convert a GRC file to graphics, a program reads the grid, looks up the color of each class, and produces an indexed or full-color picture in which every class has its own tone, which can be saved as PNG, JPEG, or TIFF. Because the codes are categories, not measurements, they should not be smoothed or averaged when the image is resized. GeoTIFF keeps the map coordinates. Supported by MapInfo Pro with Vertical Mapper, ArcGIS, Manifold GIS, and Cadcorp SIS.
Can reaConverter open GRC files?
reaConverter fully supports the GRC file format – open, edit, and export GRC files to any other popular file format with ease.
Do I need QGIS or ArcGIS to convert GRC files?
No. reaConverter reads GRC 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 GRC to another format?
reaConverter is a user-friendly tool for converting GRC files. Once installed on your computer, it allows you to convert all your .grc files at once with just a few clicks. You can even convert grc 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 GRC online?
If you only want to convert a few GRC files, you are welcome to try our free online GRC converter.
How can I turn GRC files on my computer to another format?
The best way to convert GRC 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 GRC.
How can I automate GRC 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 GRC 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 grc converter.
What else can I do with reaConverter?
Convert raster to vectorChange bit depthConvert GIS filesConvert CAD formatsChange file creation date
What formats can I convert a GRC file to?
Discover More
Beyond GRC conversion
Convert .grc 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.
