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Convert TopoJSON to CSV
Turn TopoJSON into CSV / delimited text instantly in your browser. No upload, no account, and no file ever crosses the network.
About TopoJSON
Quantized topology used by D3 and web cartography.
- Export quantizes coordinates and writes one arc per ring; arcs are not deduplicated.
About CSV / delimited text
Delimited table with lon/lat columns, a WKT geometry column, or both.
- With lon/lat output, non-point geometries are written as their centroid.
Step by step
How to convert TopoJSON to CSV
- 01
Drop your .topojson file
Open the converter and drop the TopoJSON file — parsing happens locally in a Web Worker, so nothing is uploaded.
- 02
Choose CSV as the output
Pick CSV, reproject to any of 180+ coordinate systems if needed, trim attributes and preview the geometry on a map.
- 03
Download the .csv file
Save a single file, or convert a whole batch and download everything as a ZIP. Nothing is stored after the download.
TopoJSON to CSV — questions
Is converting TopoJSON to CSV really private?
Yes. The conversion runs entirely in your browser using a Web Worker — the TopoJSON file is never sent to a server, so it works with confidential data and offline.
Do I need an account to convert TopoJSON to CSV?
No. There is no signup, no email and no install. Open the converter, drop the file and download the result.
What happens to attributes and coordinate systems?
With lon/lat output, non-point geometries are written as their centroid. You can also reproject between 180+ coordinate reference systems or add a custom proj4 definition before writing.
Need the other direction? Convert CSV to TopoJSON