Validate and Repair Geometry
Detects and fixes invalid geometries: self-intersections, open rings, and topological errors
How to use this tool?
- Upload a Shapefile (ZIP or individual files), GeoJSON, or KML.
- Choose whether you only want to validate (report) or also repair the errors.
- You will receive a detailed report and, if you chose to repair, a corrected file.
Process completed!
Your file has been processed successfully.
Common errors
- Self-intersection: the polygon crosses itself
- Open ring: the polygon does not close correctly
- Null geometry: feature with no geometry assigned
- Wrong orientation: rings in the wrong direction
These errors cause failures in spatial analysis, PostGIS, and ArcGIS.
Visual Example
make_valid automatically repairs self-intersections, open rings, and null geometries.
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Frequently Asked Questions
Invalid geometries usually originate from format conversions, incorrect manual digitizing, or imports from GPS/CAD. They are common in very old Shapefiles or ones exported from non-standard tools.
make_valid is the standard GEOS function (a geospatial library used by QGIS, PostGIS, Shapely) for repairing geometries. It converts any invalid geometry into an equivalent valid geometry, preserving as much of the original geometry as possible.
Shapefile (ZIP or individual files: .shp, .shx, .dbf, .prj, .cpg), GeoJSON, KML, KMZ, GPX, GML, GeoPackage (.gpkg), GeoParquet (.parquet), FlatGeobuf (.fgb), and TopoJSON. The output can be Shapefile ZIP or GeoJSON.
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