Convert GeoJSON Line to Polygon Online

Fill closed GeoJSON LineString features into polygon geometry. Free browser tool.

Drop GeoJSON file here or click to browse

Accepts: .geojson, .json

Powered by GDAL WebAssembly and Turf.js for accurate geometry conversion.

GeoJSON polygon output is ideal for web maps — the filled polygon renders correctly in Leaflet, Mapbox GL JS, and GeoJSON.io immediately after download.

→ Full guide: Line to Polygon Tools

Convert GeoJSON

GeoJSON to Shapefile

GeoJSON to GeoPackage

Visualization Tools

Visualize Any Format

Shapefile Viewer

Grid Tools

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 Shapefile

Buffer GeoPackage

Dissolve Tools

Dissolve GeoJSON

Dissolve Shapefile

Dissolve GeoPackage

Centroid Tools

GeoJSON Centroid

Shapefile Centroid

GeoPackage Centroid

Simplification Tools

Simplify GeoJSON

Simplify Shapefile

Simplify GeoPackage

Data Inspection

GeoJSON Inspector

Geospatial File 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

More Line to Polygon Tools

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 GeoPackage

Combine Features Tools

Combine GeoJSON Features

Combine Shapefile Features

Combine KML Features

Combine GeoPackage Features

Combine GML Features

Spatial Operations

Clip Vector Data

Explode Multi-Geometries

Raster Operations

Resample Raster

Reproject GeoTIFF

Rasterization Tools

Rasterize GeoJSON

Rasterize Shapefile

Rasterize GeoPackage

Reprojection Tools

Reproject GeoTIFF

Reproject Shapefile

Reproject Vector

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