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GGF Converter
Turn GGF files into JPG, PNG, PDF and 800+ other formats. reaConverter handles bulk conversion with consistent quality.
How to Convert .ggf Files in Bulk
1. Install reaConverter
2. Select GGF Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless GGF 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 GGF 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
GGF files: Frequently Asked Questions
What are GGF files?
GGF (Trimble Grid File) is a binary raster format for geoid models, used in Trimble Business Center and Trimble Access. The file begins with a 146-byte header that starts with the ASCII signature "TNL GRID FILE" and holds the grid bounds as minimum and maximum latitude and longitude, the cell step in both directions, the number of rows and columns, and fields for poles, missing values, scale, and flags. The data starts at offset 0x92 and runs from the top-left corner of the grid, with most files storing 4-byte little-endian floating-point heights; at least one known file, OSU91, uses 2-byte integers. A grid holds heights rather than colors, so rendering it as an image means mapping the geoid heights to a grayscale or color ramp, with missing cells shown as transparent or a flat color, while GeoTIFF or ASCII grid preserves the numeric values and the geographic extent. Common sources of geoid grids, such as GRAVSOFT or NTv2 files, are converted to GGF for use on Trimble field devices.
Can reaConverter open GGF files?
reaConverter fully supports the GGF file format – open, edit, and export GGF files to any other popular file format with ease.
Do I need QGIS or ArcGIS to convert GGF files?
No. reaConverter reads GGF 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 GGF to another format?
reaConverter is a user-friendly tool for converting GGF files. Once installed on your computer, it allows you to convert all your .ggf files at once with just a few clicks. You can even convert GGF files 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 GGF online?
If you only want to convert a few GGF files, you are welcome to try our free online GGF converter.
How can I turn GGF files on my computer to another format?
The best way to convert GGF 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 GGF.
How can I automate GGF 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 GGF 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 ggf converter.
What else can I do with reaConverter?
Convert RAW photosChange format settingsCopy metadata (EXIF, IPTC)Convert DICOM filesCrop image
What formats can I convert a GGF file to?
Discover More
Beyond GGF conversion
Convert .ggf 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.
