Polygon Fixer

Validate and repair polygon geometry instantly. Professional-grade geospatial correction for WKT, GeoJSON, and coordinates.

Total Processed 1.2M+
Avg Repair Time 14ms
Precision Rate 99.9%
Uptime 99.99%
WKT / GEOJSON
VALIDATED N/A

Validation Status

info

No validation run yet

Paste a polygon and click Check Polygon.

EPSG:4326 | ZOOM AUTO

Geometry Standards Guide

autorenew

CW vs CCW

Winding order determines interior direction. Exterior rings should be CCW and hole rings should be CW.

CW vs CCW
rule

Not closed polygon

Linear rings must be closed. The first and last coordinates must be identical to form a valid polygon.

Not closed polygon
content_copy

Duplicate points

Consecutive duplicate coordinates can cause issues in geometry processing and should be removed.

Duplicate points
call_split

Self-Intersections

Polygon edges must not cross. Intersections produce ambiguous interior/exterior topology.

Self-Intersections
donut_large

Hole outside outer ring

Inner rings must be fully contained by their outer ring.

Hole outside outer ring
filter_3

Less than 3 unique points

A valid polygon must have at least 3 unique vertices. Fewer points cannot enclose an area.

Less than 3 unique points
crop_3_2

Zero-area polygon

Polygons with zero area are invalid.

Zero-area polygon
tune

Extreme precision collapse

Polygons with extremely high precision can cause computational issues.

Extreme precision collapse
hub

Disconnected shapes (should be MultiPolygon)

Multiple disconnected shapes should be represented as a MultiPolygon.

Disconnected shapes (should be MultiPolygon)