Indian systems included
Kalianpur 1880, 1937 and 1975, the India zone grids, UTM zones 42N to 47N on both WGS 84 and Indian datums, and the WGS 84 state systems.
Simplify and Generalise a GIS Layer
Cut the vertex count of a boundary file without losing its shape. The tolerance is in metres, not degrees, so the number means what you think it means.
The layer to simplify
Drop a file or choose one
Why this matters here
Older Indian survey and revenue records sit on the Everest spheroid, not WGS 84. Treating one as the other puts everything a few hundred metres out — enough to move a plot boundary onto a neighbour.
Bulk paste
Paste a column straight out of a spreadsheet. Anything after the first two values is carried through as a label, and the result downloads as CSV.
Nothing leaves your device
The arithmetic runs in your browser with proj4. No coordinate is transmitted, logged or stored anywhere.
Frequently asked questions
What does the tolerance mean?
It is a distance in metres. A vertex is dropped when it sits closer than that to the straight line between its neighbours. Most tools ask for degrees, where 0.0001 means nothing recognisable; metres you can reason about.
Will it break my boundaries?
It can. Simplifying each polygon on its own moves shared edges independently, so two neighbouring plots that used to touch can end up with a sliver between them. For display that is fine; for anything measured, check the result first.
How much smaller will the file get?
The vertex count and the reduction are shown live as you move the slider, so you can stop at the point where the shape still looks right.
Is my file uploaded anywhere?
No. It runs in your browser.
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