Source: EPSG:4326 — WGS 84
geographic system using latitude and longitude on an ellipsoid · Area of use: World (by country)
+proj=longlat +datum=WGS84 +no_defs +type=crsMore about EPSG:4326 →
Convert EPSG:4326 to EPSG:3857
Online coordinate converter from WGS 84 (EPSG:4326) to WGS 84 / Pseudo-Mercator (EPSG:3857). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
About converting WGS 84 to WGS 84 / Pseudo-Mercator
Converting from WGS 84 (EPSG:4326) to Web Mercator (EPSG:3857) is the single most common projection transformation on the web. Every GPS coordinate, GeoJSON feature or KML point that lands on a Google, Bing, OSM or MapLibre basemap goes through this exact conversion.
The transformation is purely a projection change — both CRSs share the WGS 84 datum, so no datum shift is involved. The output is in linear metres, not degrees, with the origin at the equator/prime meridian and the world bounded by ±20,037,508.34 m east-west.
Web Mercator is conformal (preserves angles locally) but distorts area dramatically at high latitudes — Greenland looks the size of Africa. Use this conversion for visualisation and tile alignment, not for distance or area calculations.
Why people convert EPSG:4326 to EPSG:3857
- Plotting GPS coordinates on a slippy-tile web map (Leaflet, OpenLayers, MapLibre)
- Generating XYZ raster or vector tiles aligned with Google/OSM basemaps
- Sharing data with web GIS clients that expect Web Mercator
- Converting GeoJSON inputs to coordinates compatible with map-tile APIs
Try it: Eiffel Tower, Paris
Input (EPSG:4326): 2.2945, 48.8584
Convert EPSG:4326 to EPSG:3857 in code
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:4326", "EPSG:3857", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)Target: EPSG:3857 — WGS 84 / Pseudo-Mercator
projected system measured in linear units (typically metres) · Area of use: World - 85°S to 85°N
+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs +type=crsMore about EPSG:3857 →
Frequently asked questions
- Is converting EPSG:4326 to EPSG:3857 lossless?
- Within the valid latitude range (±85.0511°), yes — it is a deterministic, invertible projection on the WGS 84 sphere. Outside that range Web Mercator is undefined.
- How accurate is this conversion?
- Better than a millimetre. There's no datum shift, only a projection formula, so accuracy is limited by floating-point precision rather than any real-world uncertainty.
- Why are my Web Mercator metres so much bigger than Earth distances?
- At latitudes above the equator a 'Web Mercator metre' represents a smaller real-world distance. At 60°N, 1 metre on the projected plane is about 0.5 m on the ground.
- How accurate is converting WGS 84 to WGS 84 / Pseudo-Mercator?
- Projection-only conversions are accurate to floating-point precision. If a datum shift is involved, browser-based tools use Helmert parameters which are accurate to roughly 1-5 m; for surveying-grade work apply the official grid-shift transformation in a desktop GIS.
- Does my data leave the browser when I use this converter?
- No. All coordinate transformations are computed locally in your browser using proj4js. The coordinates you enter are never transmitted to any server.