Edge Matcher

Try with demo data

Match a fine polygon layer to whichever coarse boundary polygon it overlaps the most, then extend each group's edges outward so every group's result meets its boundary exactly. Works the same whether the two layers are adjacent levels (admin 4 into 3) or far apart (admin 4 straight into 0).

Coarse layer should be a clean coverage — run Topology Cleaner first if unsure.

Input layer

Drop a file here

or browse

The layer to match and extend — any polygon set, any admin level. GeoJSON · GeoParquet · GeoPackage · Shapefile (ZIP).

Overlay layer

Drop a file here

or browse

The boundary to match and clip against, one level up or many.

Fitting

All input features go into the one overlay feature most of them overlap.

Schema fill (optional)

Cascade admin-hierarchy columns down before export

Your files never leave your device.