GIS Shape Validator

Validate GeoJSON, KML, and Shapefile geometry for topological correctness. Detects self-intersections, invalid rings, and other geometry errors.

Drop SVG, KML or GeoJSON maps here or click to browse

Local processing · Fast georeferencing & simplification

How to Use

Upload GIS file

Upload a GeoJSON, KML, or Shapefile (ZIP).

Run validation

The tool checks for geometry errors: self-intersections, invalid rings, coordinate out-of-range.

Review report

Download a detailed validation report with error locations.

GIS Geometry Validation

Invalid geometry is a common problem in GIS workflows. Self-intersecting polygons, unclosed rings, and coordinate errors cause processing failures in PostGIS, ArcGIS, QGIS, and web mapping APIs. This validator checks your GIS files for these issues before they cause problems downstream.

Real-World Examples & Use Cases

Pre-processing Validation

Validate GeoJSON data before uploading to PostGIS or running GIS analysis.

Frequently Asked Questions

What causes self-intersecting polygons?▼

Self-intersections occur when a polygon ring crosses itself. They are common when digitising boundaries manually or when simplification creates overlapping segments.

Why does GIS software reject invalid geometry?▼

Invalid geometry causes errors in spatial operations like intersection, union, and buffering. Most GIS platforms require valid geometry before processing.

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