GIS Tool Matrix
Every operation below runs locally in your browser. Pick a task, then a file format.
Expand every feature outward by a distance in kilometers.
Merge adjacent polygons, optionally grouped by an attribute.
Reduce vertex count with Douglas-Peucker simplification.
Compute a centroid point for every feature.
Compute the dataset envelope as a bounding-box polygon.
Build the smallest convex polygon enclosing the layer.
Keep only features whose attribute matches a value.
Reproject the whole layer between EPSG / WGS84 coordinate systems.
Turn every vertex into a Point feature.
Split Multi* geometries into single-part features.
Annotate each feature with length (m) and/or area (m²).
Repair invalid polygons with turf buffer(0) / rewind heuristics.
Build a concave hull around the layer.
Convert polygons to line features.
Smooth line and polygon geometries with Chaikin-style iterations.
Flag invalid or null geometries on each feature.
Bin points into hexagonal cells (H3-style) and count per cell.
Compute global Moran’s I and local LISA scores for a numeric field.
Create or overwrite an attribute from a simple expression.