Convert NTF to FlatGeobuf online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
Efficiently convert from NTF to FGB format
All processing is done locally in your browser
Output standard FGB format
Convert ntf to fgb online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.
UK NTF (National Transfer Format) is a geographic data exchange format defined by the UK Ordnance Survey, primarily used for distributing official UK topographic data. NTF is a complex binary format supporting multiple feature types and topological relationships. It is widely used in UK government and mapping departments.
FlatGeobuf is a geospatial data format based on FlatBuffers, designed for efficient geospatial data storage and transmission. It supports spatial indexing (based on Packed Hilbert Curve R-tree) enabling spatial filtering during reads, loading only data for the area of interest. FlatGeobuf is particularly suited for web applications and streaming processing scenarios requiring fast random access to large datasets.
Converting NTF to FlatGeobuf is one of the most common workflows in GIS. NTF data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while FlatGeobuf is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your NTF files, keeps geometry and attributes intact, and writes clean FlatGeobuf output — entirely in your browser, so your data never leaves your device.
No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.
Yes, completely free with no sign-up and no usage limits.
By default the output keeps the source coordinate system. If your NTF file uses a projected CRS (like UTM), you can search any EPSG coordinate system by keyword or code and reproject in one step. Note: output formats that require WGS84 by specification (KML, KMZ, GPX) always reproject to WGS84 automatically.
Yes — drop several NTF files at once and each one produces its own FlatGeobuf output.
Upload your NTF file — drag and drop it onto the page, or browse from your device. You can add several files at once for batch conversion.
The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.
Download the FlatGeobuf file. Each input produces its own output, ready to use in your GIS, web map, or archive.