CSV to GeoJSON Converter - Create Map Data from Spreadsheets

Convert CSV coordinates to GeoJSON for mapping. Select lat/lng columns, customize properties. Works with Leaflet, Mapbox. Private.

CSV Input

0 locations

GeoJSON Output

0 features

Latitude column:

Longitude column:

Delimiter:

First row is header

Coordinate precision:

Minify output

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Frequently Asked Questions

GeoJSON is a standard JSON format for encoding geographic data structures. It represents features like points, lines, and polygons with coordinates, making it perfect for web mapping libraries like Leaflet, Mapbox, and OpenLayers.

GeoJSON is supported by all major web mapping libraries including Leaflet, Mapbox GL JS, OpenLayers, Google Maps API, and Maplibre. It's also compatible with GIS software like QGIS and ArcGIS.

After pasting your CSV, use the dropdown menus to choose which columns contain latitude (Y coordinates) and longitude (X coordinates). The tool auto-detects common column names like 'lat', 'lng', 'latitude', 'longitude'.

All columns except the selected coordinates become GeoJSON feature properties. These properties appear in map popups and can be used for styling, filtering, and labeling your map markers.

GeoJSON uses [longitude, latitude] order, following the [x, y] convention. This tool automatically converts from your CSV columns (usually latitude, longitude) to the correct GeoJSON format.

GeoJSON uses WGS84 (EPSG:4326) by default, the same system as GPS. Your coordinates should be decimal degrees: latitude between -90 and 90, longitude between -180 and 180.

The tool validates coordinates automatically, warning about out-of-range values. You can also paste the output into geojson.io or a GeoJSON validator to visualize and verify your data.

Yes. The converter processes files in-browser, handling thousands of points efficiently. For very large datasets (100K+ points), consider breaking into smaller files or using GeoJSON streaming tools.

Completely. All conversion happens in your browser using JavaScript. No coordinates or data are uploaded to any server. Your CSV files and locations never leave your device.

Yes. Adjust decimal places to balance file size and accuracy. 6 decimals (~0.1m precision) works for most uses. Reduce to 4 for city-level data, increase to 8 for surveying.

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