twineconvert

free · in-browser · no upload

GeoJSON to WKT
Converter

Drop your GeoJSON file. We'll convert it to WKT right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .geojson, .json

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a GeoJSON from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your WKT the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert GeoJSON → WKT

What this conversion is actually for

Every spatial database (PostGIS, Oracle Spatial, SQL Server, SQLite/SpatiaLite) takes WKT in its INSERT and UPDATE statements. If your data is GeoJSON (the format Mapbox, Leaflet, and most web APIs emit), you need to convert it to WKT before loading. Output is one WKT literal per line so you can paste it straight into a SQL editor or feed it into a script.

A real example

You exported features from QGIS as GeoJSON and want to bulk-insert them into a PostGIS table. Convert here, then use the WKT in INSERT INTO geom_table (geom) VALUES (ST_GeomFromText('...')).

Troubleshooting

Output is empty.

The input may be a FeatureCollection with no geometries (every Feature has geometry: null). Check the GeoJSON in a text editor and confirm the geometry objects are populated.

Formats involved

About GeoJSON and WKT

GeoJSON, Geographic JSON (RFC 7946)

GeoJSON encodes geographic features (points, lines, polygons) as JSON objects following RFC 7946 (2016). Coordinates are always [longitude, latitude] in WGS84. Supported natively by Leaflet, Mapbox GL, OpenLayers, ArcGIS, QGIS, and PostGIS — the default exchange format for web mapping. Lighter and easier to inspect than KML or shapefile (.shp).

How to open

GitHub renders GeoJSON files inline as interactive maps. geojson.io provides an in-browser editor + validator. QGIS opens .geojson directly. Leaflet/Mapbox apps consume it programmatically.

Full GeoJSON format guide →
WKT, WKT

WKT is a file format we support converting. Detailed format information is being added, for now, drop your file in the converter above and you'll get the conversion you came for.

How to open

Most operating systems open this format with a default application; if not, search for a free reader/viewer for the format.

Full WKT format guide →

You may also need

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Convert your GeoJSON to other formats

FAQ

Common questions

Is this GeoJSON → WKT converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert GeoJSON to WKT?

Web mapping data exchange (Leaflet, Mapbox, ArcGIS). File interchange. The most common reason to convert is compatibility, WKT works in places where GeoJSON doesn't, or vice versa.

How do I open a GeoJSON file in the first place?

GitHub renders GeoJSON files inline as interactive maps. geojson.io provides an in-browser editor + validator. QGIS opens .geojson directly. Leaflet/Mapbox apps consume it programmatically.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.