Convert OGC GML files (.gml) from INSPIRE, Ordnance Survey, USGS, and national cadastral registries into modern standard RFC 7946 GeoJSON in your browser. 100% private with zero server uploads.
Detailed side-by-side format architecture for GML Document (.gml) and GEOJSON Document (.geojson). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .gml file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .geojson directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert GML to GEOJSON locally
pandoc input.gml -o output.geojsonWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
GML (Geography Markup Language) is an XML grammar defined by the Open Geospatial Consortium (OGC) to express spatial features, coordinate reference systems, and geographic properties. It is the mandatory data exchange standard for European INSPIRE spatial datasets, Ordnance Survey MasterMap, and international cadastral agencies.
convrtr supports both GML 2.x (<gml:coordinates>) and modern GML 3.x (<gml:pos>, <gml:posList>), including Points, LineStrings, Polygons with interior holes, MultiPoints, and MultiPolygons, with automatic coordinate axis normalization (handling EPSG:4326 Lat/Lon vs Lon/Lat).
GML is notoriously verbose and complex to parse, making it unsupported by modern web map libraries like Leaflet and Mapbox GL JS without heavy backend GIS servers like GDAL/OGR. GeoJSON is lightweight, universally supported in JavaScript, and immediately ready for modern map visualization.
Never. All XML parsing, coordinate extraction, and GeoJSON synthesis happen 100% locally inside your browser client.
GML Document (GML) and GEOJSON Document (GEOJSON) serve distinct roles across the digital workflow. Converting to GEOJSON provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (GEOJSON) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .gml files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Convert web media, local files, and document assets directly in Chrome Side Panel using client-side WebAssembly, zero-server uploads, and the official convrtr browser extension.
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