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Generalize Polygons QGIS 4 compatibility
QGIS 4 ready Active
Yes — Generalize Polygons supports QGIS 4 (declared max version 4.99.0).
Topology-preserving polygon simplification using the weighted Visvalingam algorithm — no slivers, no gaps.
About
Reduces the vertex count of polygon layers while preserving shape and topology. Shared borders between adjacent polygons are simplified exactly once, so both neighbours always receive the same simplified edge. This guarantees that no slivers, gaps, or overlaps are introduced — a property not provided by most standard simplification tools. The algorithm is based on the weighted Visvalingam-Whyatt method as used in MapShaper (mbloch/mapshaper). Triangle areas are weighted by the angle at the centre vertex, so nearly-collinear points are removed first while geometrically significant vertices are protected. You can find the button in QGIS in the menu Vector > Generalize Polygons... or use the tools panel.
| Author | Peppo Herney |
|---|---|
| Downloads | 1,894 |
| Latest version | 0.6.2 |
| Last updated | 2026-04-04 (194 days ago) |
| Min QGIS | 3.40.0 |
| Max QGIS | 4.99.0 |
| QGIS 4 ready | Yes |
| Maintenance | Active |
| Category | Vector tools |
| Tags |
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