Fix Invalid Geometries

Repair self-intersections, ring ordering errors, and other geometry issues using the GEOS MakeValid algorithm. Upload any vector format.

All processing happens locally in your browser. Your files never leave your device.

Fixing invalid geometries with the GEOS MakeValid algorithm resolves self-intersections, degenerate rings, and winding-order errors that cause operations in QGIS, PostGIS, and GDAL to fail with topology errors. Run this before any geometry-sensitive operation.

→ Full guide: Spatial Operations

Visualization Tools

Visualize Any Format
GeoJSON Viewer
Shapefile Viewer
KML Viewer
CSV Viewer
GPX Viewer

Grid Tools

Grid Generator

Bounding Box Tools

GeoJSON Bounding Box
Shapefile Bounding Box
KML Bounding Box
GeoPackage Bounding Box
GML Bounding Box

Measurement Tools

Measure GeoJSON Features
Measure Shapefile Features
Measure KML Features
Measure GeoPackage Features
Measure GML Features

Buffer Tools

Buffer GeoJSON
Buffer Shapefile
Buffer KML
Buffer GeoPackage
Buffer GML

Dissolve Tools

Dissolve GeoJSON
Dissolve Shapefile
Dissolve KML
Dissolve GeoPackage
Dissolve GML

Centroid Tools

GeoJSON Centroid
Shapefile Centroid
KML Centroid
GeoPackage Centroid
GML Centroid

Simplification Tools

Simplify GeoJSON
Simplify Shapefile
Simplify KML
Simplify GPX
Simplify GeoPackage

Data Inspection

Geospatial File Inspector
GeoJSON Inspector
Shapefile Inspector
GeoTIFF Inspector

Feature Selection Tools

Select GeoJSON Features
Select Shapefile Features
Select KML Features
Select GeoPackage Features
Select GML Features

Filter by Attribute Tools

Filter GeoJSON by Attribute
Filter Shapefile by Attribute
Filter KML by Attribute
Filter GeoPackage by Attribute
Filter GML by Attribute
Filter Any Vector Format

Convex Hull Tools

Convex Hull GeoJSON
Convex Hull Shapefile
Convex Hull KML
Convex Hull GeoPackage
Convex Hull GML

Polygon to Line Tools

GeoJSON Polygon to Line
Shapefile Polygon to Line
KML Polygon to Line
GeoPackage Polygon to Line
GML Polygon to Line

Line to Polygon Tools

GeoJSON Line to Polygon
Shapefile Line to Polygon
KML Line to Polygon
GeoPackage Line to Polygon
GML Line to Polygon

Explode to Points Tools

Explode GeoJSON to Points
Explode Shapefile to Points
Explode KML to Points
Explode GeoPackage to Points
Explode GML to Points

Flatten Multi-Geometry Tools

Flatten GeoJSON
Flatten Shapefile
Flatten KML
Flatten GeoPackage
Flatten GML

Combine Features Tools

Combine GeoJSON Features
Combine Shapefile Features
Combine KML Features
Combine GeoPackage Features
Combine GML Features

More Spatial Operations

Clip GeoJSON
Clip Shapefile
Clip Vector Data
SQL Query
Explode Multi-Geometries
Repair Shapefile

Raster Operations

Crop GeoTIFF
Crop Raster
Resize GeoTIFF
Resample Raster
Extract Band
Reproject GeoTIFF

Rasterization Tools

Rasterize GeoJSON
Rasterize Shapefile
Rasterize KML
Rasterize GPX
Rasterize GeoPackage
Rasterize GML

Reprojection Tools

Reproject GeoTIFF
Reproject Shapefile
Reproject Vector
Assign CRS

Coordinate Conversion Tools

Lat/Long to DMS

Decimal to degrees/minutes/seconds

DMS to Lat/Long

Degrees/minutes/seconds to decimal

Lat/Long to UTM

Geographic to UTM coordinates

UTM to Lat/Long

UTM to geographic coordinates