Drag and drop or select a file to import.
Shapefile, GeoJSON and TopoJSON files
and Zip archives are supported.
Points located at the vertex
of more acute angles are
preferentially removed, for
a smoother appearance.
Lines are simplified by iteratively
removing the point that forms
the least-area triangle with two
Simplified lines remain within a
given distance of original lines.
Good for thinning dense points
but tends to form spikes at high
Remove line intersections. Works
by rolling back simplification
along intersecting segments.
Automatically fix minor topology
errors by snapping together points
that are almost identical. Doesn't
apply to TopoJSON files.
Prevent small polygons from
disappearing at high simplification.
Protects the largest ring of multi-
Round coordinates by a specified
precision. Reduces the size of GeoJSON
files but can cause intersections and
collapsed shapes. Uses same units as
the source file, e.g. decimal degrees for
most unprojected files.