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.
Prepare a State Boundary Package
Turn a state village shapefile into the folder this site serves. It reprojects, splits by taluka, thins a preview and joins the outlines, all in this browser. Nothing is uploaded and nothing needs installing.
The package never leaves this machine. It is read here, converted here, and handed back as a folder for you to upload.
Drop a state package
The zip holding the .shp, .dbf, .shx and .prj
One state at a time. A large state takes a few minutes and the tab must stay open.
Why not just upload the shapefile to the server?
Because to show one taluka the browser would have to fetch the whole state. Andaman and Nicobar is 582 villages in nearly four megabytes, and it is the smallest package there is. A mainland state runs to tens of thousands of villages. Nobody waits for all of that to look at one taluka.
There is a second reason. The packages are in India’s Lambert Conformal Conic projection, in metres from a false origin. Converting that to latitude and longitude has to happen somewhere, and doing it for every village on every visit wastes the same work over and over.
So it is done once, here. The state is split into one file per taluka, a thinned copy of the whole state is made so the map can draw immediately, and the villages are joined into taluka, district and state outlines. What you upload is a folder of small files the site can serve directly.
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
Which coordinate systems are supported?
WGS 84 and Web Mercator, UTM zones 42N to 47N on both WGS 84 and Indian datums, the Kalianpur India zone grids, and the WGS 84 state systems including Maharashtra. Each is listed with its EPSG code so you can check it against your source.
How accurate is the datum shift?
Transformations use the standard seven-parameter shifts published for each datum. Between Everest-based Indian datums and WGS 84 the difference is a few hundred metres, so using the wrong one is immediately obvious on the map preview.
Can I convert a whole list at once?
Yes. Switch to the bulk tab and paste a column. Comma, tab, semicolon or space separated all work, and anything after the first two values is kept as a label. Download the result as CSV.
Which value goes in which box?
Easting or longitude on the left, northing or latitude on the right. The labels change with the system you pick, so you never have to remember. Bulk mode has a swap option.
Is anything uploaded?
No. Everything runs in your browser using proj4, so no coordinate ever leaves your device.
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GeoJSON Validator
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