Convert coordinates between any EPSG CRS
Free, fast, accurate online coordinate converter. Pick a source and target coordinate reference system, paste your coordinates, and get the result instantly — all in your browser. Supports 7,000+ EPSG codes including WGS 84, Web Mercator, UTM, NAD83, ETRS89, OSGB36, and every state plane and national grid.
Popular transformations
- WGS 84 → Web MercatorEPSG:4326 → EPSG:3857
- WGS 84 → UTM Zone 33NEPSG:4326 → EPSG:32633
- WGS 84 → British National GridEPSG:4326 → EPSG:27700
- WGS 84 → RGF93 / Lambert-93EPSG:4326 → EPSG:2154
- WGS 84 → ETRS89 / UTM 32NEPSG:4326 → EPSG:25832
- NAD27 → WGS 84EPSG:4267 → EPSG:4326
- NAD83 → WGS 84EPSG:4269 → EPSG:4326
- Web Mercator → WGS 84EPSG:3857 → EPSG:4326
Official datum transformations
Published EPSG operations with parameters, accuracy and area of use:
Browse popular coordinate systems
- EPSG:4326WGS 84
- EPSG:3857WGS 84 / Pseudo-Mercator
- EPSG:3395WGS 84 / World Mercator
- EPSG:4978WGS 84
- EPSG:7789ITRF2014
- EPSG:4267NAD27
- EPSG:4269NAD83
- EPSG:6318NAD83(2011)
- EPSG:4322WGS 72
- EPSG:26910NAD83 / UTM zone 10N
- EPSG:26911NAD83 / UTM zone 11N
- EPSG:26912NAD83 / UTM zone 12N
- EPSG:26913NAD83 / UTM zone 13N
- EPSG:26914NAD83 / UTM zone 14N
- EPSG:26915NAD83 / UTM zone 15N
- EPSG:26916NAD83 / UTM zone 16N
- EPSG:26917NAD83 / UTM zone 17N
- EPSG:26918NAD83 / UTM zone 18N
- EPSG:26919NAD83 / UTM zone 19N
- EPSG:5070NAD83 / Conus Albers
- EPSG:2163US National Atlas Equal Area
- EPSG:2227NAD83 / California zone 3 (ftUS)
- EPSG:2230NAD83 / California zone 6 (ftUS)
- EPSG:2236NAD83 / Florida East (ftUS)
Guides
Datum vs Projection: What's the Difference and Why It Matters
Datum and projection are the two halves of every Coordinate Reference System. Confusing them is the most common cause of metre-scale GIS errors. Here's how each works, in plain language.
6 min read
UTM Zones Explained: How to Pick the Right Zone for Your Data
UTM divides the world into 60 north-south zones, each 6° wide, projected separately to keep distortion low. Here's how to identify the right zone, what UTM is and isn't good for, and the difference between WGS 84 UTM and ETRS89 UTM.
7 min read
WGS 84 vs NAD83: Why They're Not the Same Datum
WGS 84 and NAD83 were designed to be near-identical in 1986 but have diverged by 1-2 m due to plate motion. Here's exactly why, when it matters, and how to convert between them.
5 min read
Web Mercator vs True Mercator (EPSG:3857 vs EPSG:3395)
Web Mercator and True (ellipsoidal) Mercator look the same but differ by up to 20 km at high latitudes. Here's why both exist, when each is used, and the gotchas.
5 min read
State Plane Coordinate System: A Plain-Language Guide
What State Plane is, how its zones are organised, why each state has its own projection, and how to pick the right EPSG code for your project.
6 min read
Lat/Lon or Lon/Lat? The EPSG:4326 Axis Order Problem, Solved
EPSG:4326 officially puts latitude first, but GeoJSON, proj4 and most software put longitude first. This mismatch is the most common coordinate bug in GIS — here is how every major tool handles it.
6 min read
ITRF, Epochs and Plate Motion: Why Modern Coordinates Drift
ITRF2020, ETRS89, GDA2020, epoch 2010.0 — modern geodesy attaches dates to coordinates because the ground itself moves. Here is what reference frames and epochs actually mean, and when you must care.
7 min read
Multiple EPSG Transformations Exist — Which One Should You Use?
NAD27 to WGS 84 has dozens of published transformations; ED50 has even more. Area of use, accuracy and method tell you which one is right for your data — here is how to read them.
6 min read
How to convert coordinates between CRSs
- 1. Select the source CRS — the coordinate reference system your input is in. If you don't know, it's almost always WGS 84 (EPSG:4326) for GPS-derived data.
- 2. Select the target CRS — what you want to convert to. For web maps, choose Web Mercator (EPSG:3857); for surveying in metric units, an appropriate UTM zone or national grid.
- 3. Enter your coordinates— as decimal "lon, lat" (or "x, y") or as DMS such as "40°26'46"N 79°58'56"W". The result updates instantly.
Frequently asked questions
- What is an EPSG code?
- An EPSG code is a numeric identifier maintained by the IOGP (originally the European Petroleum Survey Group) for a specific Coordinate Reference System or coordinate transformation. Each code uniquely defines a CRS by its datum, ellipsoid, projection and units.
- Is this converter free?
- Yes. EPSG Transform is free to use with no registration, no rate limits and no advertising. All conversions are computed in your browser — your coordinates never leave your device.
- How accurate are the conversions?
- Projection-only conversions (e.g. WGS 84 ↔ Web Mercator) are accurate to floating-point precision. Datum shifts using Helmert seven-parameter transformations are accurate to a few metres. High-precision grid-based datum shifts (NTv2, NADCON, OSTN15) require external grid files and are not currently performed in-browser.
- Can I link directly to a specific transformation?
- Yes. Every popular pair has a permalink of the form /transform/epsg-XXXX-to-epsg-YYYY (for example /transform/epsg-4326-to-epsg-3857). Share the URL — it works without JavaScript and renders a fully indexable HTML page.
- What CRSs do you support?
- All 7,000+ active EPSG codes — geographic (WGS 84, NAD83, ETRS89), projected (UTM, Web Mercator, state plane, national grids), geocentric, vertical and compound systems.
- Do my coordinates leave my browser?
- No. Coordinate transformations are computed locally with proj4js. The site is statically delivered and does not transmit, store or log the coordinates you enter.