Geometry Simplifier
Simplify GeoJSON geometries using the Douglas-Peucker algorithm. Reduce coordinate count and file size while preserving shape. All processing runs in your browser.
Powerful Geometry Simplification
Reduce complexity while preserving shape — the industry-standard Douglas-Peucker algorithm with real-time preview and comparison.
Douglas-Peucker Algorithm
The gold standard for polyline and polygon simplification. Iteratively removes points that contribute least to the overall shape, giving you optimal results at any tolerance level.
Real-Time Comparison
See original and simplified geometries side by side on the map. Blue shows the original shape, green shows the simplified result. Adjust the tolerance slider and watch changes instantly.
Detailed Statistics
Track coordinate count reduction, file size savings, and reduction percentage. Make informed decisions about the right balance between simplification and accuracy.
How to Simplify GeoJSON
Input GeoJSON
Paste your GeoJSON in the left editor, or drag & drop a .geojson/.json file. Any valid GeoJSON type (Feature, FeatureCollection, Geometry) is accepted.
Adjust Tolerance
Use the tolerance slider to control simplification strength. Lower values preserve more detail, higher values produce simpler geometries. The logarithmic scale gives fine control at small tolerances.
Compare Results
Review the simplified GeoJSON in the output editor. Check the statistics bar for coordinate reduction and file size savings. Use the map to visually compare original (blue) and simplified (green) shapes.
Export Simplified Data
Copy the simplified GeoJSON to clipboard or export as a .geojson file. Use Minify to further reduce file size for production use.
Why Use Our Geometry Simplifier
Logarithmic Tolerance Control
Fine-grained control with a logarithmic slider from 0.0001 to 1 degree. Type exact values for precision.
High Quality Mode
Enable Radial-Distance preprocessing for better results at the cost of slightly longer processing time.
Visual Comparison
Original and simplified geometries rendered on the same map with distinct colors for easy visual comparison.
Drag & Drop Import
Drag a .geojson or .json file directly onto the editor. No file dialogs needed.
100% Free
No usage limits, no account required. Professional geometry simplification at zero cost.
Privacy First
All processing runs in your browser. No data is sent to any server.
Frequently Asked Questions
What is the Douglas-Peucker algorithm?
What does the tolerance value mean?
What does High Quality mode do?
What GeoJSON types can be simplified?
Is there a file size limit?
Is my data sent to a server?