Mapshaper

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mapshaper

Settings

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History

enable undo

clear undo history

view command history

create snapshot

Unfortunately, mapshaper can't run in this web browser

For best results, try Google Chrome or Mozilla Firefox.

Select

Clip

Erase

To shape

Frame

Bounds

Cancel

Delete

Keep

Duplicate

Split

Bounds

Edit data

Clear

Export options

Layers

File format

Enter options from the command line interface for the -o command. Examples: bbox no-quantization precision=0.001. Click to see all options.

choose output directory

save to clipboard

Export

Messages

No messages yet.

Clear all

Add basemap layer

Name (optional)

Option 1: Mapbox style URL and key

Option 2: raster tile URL template

TMS (reversed y-index)

Add

Cancel

Display options

detect line intersections

Mark points where a layer's lines cross or overlap.

compare with original

Overlay the original shapes to compare before and after an edit. Only works with the buffer, smooth and simplify commands.

Basemaps

Add a basemap

Projections

Preview

Apply

Simplification

prevent shape removal

Prevent small polygon features from disappearing at high simplification. Keeps the largest ring of multi-ring features.

use planar geometry

Treat x, y values as Cartesian coordinates on a plane, rather than as longitude, latitude coordinates on a sphere.

Method

Douglas-Peucker

Simplified lines remain within a set distance of original lines. Good for thinning dense points, but spikes tend to form at high simplification.

Visvalingam / effective area

Lines are simplified by iteratively removing the point that forms the least-area triangle with two adjacent points.

Visvalingam / weighted area

Points located at the vertex of more acute angles are preferentially removed, for a smoother appearance.

Apply

Import files

with advanced options

Drop, paste or select files to import.

Shapefile, GeoJSON, TopoJSON, GeoPackage, FlatGeobuf, GeoParquet, GeoTIFF, KML, CSV and more are supported. Files can be zipped or gzipped.

GeoPackage layers

Enter options from the command line interface. Examples: snap no-topology encoding=big5. Click to see all options.

Submit

Add files · Draw:

Layers

Map frame

add map frame

No data has been added

Layers

Console

0 line intersections repair