What coordinate reference systems does GeoReproject support?

GeoReproject supports 5,000+ EPSG coordinate reference systems including WGS 84 (EPSG:4326), Web Mercator (EPSG:3857), NAD83, NAD27, ETRS89, UTM zones, British National Grid (EPSG:27700), Lambert-93, RD New, and many more. You can also enter custom PROJ strings for unlisted systems.

What file formats does GeoReproject support?

GeoReproject supports GeoJSON, WKT (Well-Known Text), KML, CSV, and GML input formats. Output can be downloaded as GeoJSON, WKT, KML, or CSV.

Is GeoReproject free to use?

Yes, GeoReproject is completely free. It runs entirely in your browser using proj4js — no files are uploaded to any server and no sign-up is required.

How do I convert coordinates from WGS 84 to Web Mercator?

Select EPSG:4326 (WGS 84) as the source CRS and EPSG:3857 (Web Mercator) as the target CRS. Paste your GeoJSON, WKT, or coordinate data into the input panel and click Reproject.

Coordinate Reprojection

Transform geometries between spatial reference systems. Supports GeoJSON, Shapefile, GeoPackage, WKT, KML and more.

Source CRS

WGS 84 · Geographic 2D · degrees

Target CRS

Web Mercator · Projected 2D · metres

Input

Output

Output will appear here after reprojection

Output format

Supported Formats

GeoJSON

Reproject Points, LineStrings, Polygons, and FeatureCollections between any EPSG system.

WKT

Parse and transform Well-Known Text point geometries.

KML

Convert Keyhole Markup Language placemarks to your target projection and export back to KML.

CSV

Transform comma-separated lon/lat columns to any projected coordinate system.

GML

Geography Markup Language point coordinate conversion.

Custom PROJ

Enter any custom PROJ4 string to define a source or target CRS not in the registry.

Common Coordinate System Conversions

EPSG:4326 to EPSG:3857 — WGS 84 (GPS) to Web Mercator (Google Maps, OpenStreetMap)

EPSG:3857 to EPSG:4326 — Web Mercator to geographic latitude/longitude

EPSG:4326 to UTM — WGS 84 to any UTM zone (32N, 33N, 18N, etc.)

EPSG:4326 to EPSG:27700 — WGS 84 to British National Grid

EPSG:4269 to EPSG:4326 — NAD83 to WGS 84

EPSG:4326 to EPSG:2154 — WGS 84 to Lambert-93 (France)

EPSG:4326 to EPSG:28992 — WGS 84 to RD New (Netherlands)

Frequently Asked Questions

What is coordinate reprojection?

Coordinate reprojection (also called coordinate transformation) is the process of converting geospatial data from one coordinate reference system (CRS) to another. Different mapping platforms, datasets, and regions use different CRS standards — for example, GPS devices use WGS 84 (EPSG:4326) while web map tiles use Web Mercator (EPSG:3857).

Is my data sent to a server?

No. GeoReproject runs entirely in your browser using the open-source proj4js library. No data is uploaded or transmitted anywhere.

What is an EPSG code?

EPSG codes are numeric identifiers assigned by the EPSG Geodetic Parameter Dataset to coordinate reference systems, datums, and projections. Common codes include EPSG:4326 (WGS 84), EPSG:3857 (Web Mercator), and EPSG:32632 (UTM Zone 32N).

Can I use a custom projection not in the list?

Yes. Select "Custom EPSG / PROJ string" from either CRS dropdown and enter any valid EPSG code or PROJ4 definition string.