Combine multiple GeoJSON files into a single FeatureCollection. Drag & drop your files — all merging happens in your browser. Free, private, no account required.
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Merging combines all features from multiple GeoJSON FeatureCollections into a single FeatureCollection. Each feature retains its original geometry and properties. The result is a valid GeoJSON file containing every feature from every input file.
Each feature keeps its own properties unchanged. If features from different files have different property schemas, the merged file will contain features with varying property sets. This is standard GeoJSON behavior — features don't need identical properties.
GeoJSON uses WGS84 (EPSG:4326) by specification. If your files use different coordinate systems, use the GeoDataTools App CRS reprojection feature to convert them first before merging.
There's no hard limit, but performance depends on your browser. Files up to ~50MB each typically work well. For very large datasets, the full GeoDataTools App with Web Workers handles larger files better.
Yes, completely. All merging happens inside your browser using JavaScript. Your files are never uploaded to any server and never leave your device.
Want to filter, analyze, and visualize the merged GeoJSON on an interactive map?
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