How to use GeoJSON Simplifier
Simplification is useful for web display and transfer, not cadastral, legal, or precision boundaries. Tolerance uses current CRS units.
- Choose GeoJSON and record original features, vertices, and size.
- Enter a small tolerance appropriate to CRS units.
- Compare original and simplified bounds, corners, holes, and intersections.
- Download a copy after accepting the error; never overwrite the source.
What this tool helps with
- Reduces web-map payload
- Instant vertex and size comparison
- Processing runs in this browser tab; the file is not uploaded to FreeTool to perform the task.
Compatibility and limitations
- Geometry changes, so legal or precision boundaries are unsuitable
- Geographic tolerance is degrees, not meters
- Invalid polygons and topology gaps are not automatically repaired
Frequently asked questions
What tolerance should I use?
Confirm CRS units, start very small for longitude/latitude, and review at the intended map scale.
Why do adjacent polygons develop gaps?
Per-feature simplification does not preserve shared topology; use a topology-aware GIS workflow.
Is data uploaded?
Processing runs in this browser tab; the file is not uploaded to FreeTool to perform the task.