Convert coordinates
Lambert 93, UTM, Web Mercator, national grids, GPS degrees or DMS. One point or a whole table, and nothing leaves your browser.
How it works
- 1
Pick the system your coordinates are in and the one you want. The list has the national grids of a dozen countries, every UTM zone, Web Mercator and plain latitude and longitude.
- 2
Paste the coordinates, one point per line. Decimal degrees, degrees minutes seconds with N S E W letters, metres with a comma, a space or a tab: the page reads them all, and keeps any text after the numbers as a label.
- 3
Read the table, copy it, or download it as CSV. The CSV drops into Excel, into QGIS, or into the CSV to KML converter on this site.
Systems in the list
Every definition is the EPSG registry's, run through proj4. The main ones, and what they are for.
| System | Where it is used |
|---|---|
| WGS 84 (EPSG:4326) | GPS receivers, phones, Google Maps, KML and GeoJSON. Latitude and longitude in degrees. |
| Web Mercator (EPSG:3857) | The tiles of every web map. Metres, but distorted away from the equator: never measure in it. |
| RGF93 / Lambert-93 (EPSG:2154) | The legal system of metropolitan France since 2000: cadastre, IGN, every French public dataset. |
| RGF93 / CC42 to CC50 | The nine French conic zones, one per degree of latitude, used by surveyors and local authorities where Lambert-93's distortion is too large. |
| NTF / Lambert II étendu (EPSG:27572) | The French system before Lambert-93. Old plans and legacy databases still carry it. |
| UTM zones (EPSG:326xx and 327xx) | The 60 six-degree strips used worldwide, north and south. The page can pick the zone from each point. |
| British National Grid, RD New, LV95, Lambert 72 and 2008, Gauss-Krüger, ETRS89 UTM, CS92, Monte Mario, SIRGAS, GDA2020 | The national grids of the United Kingdom, the Netherlands, Switzerland, Belgium, Germany, Spain, Poland, Italy, Brazil and Australia. |
What it does not do
- Accuracy depends on the datum shift the EPSG registry publishes for each system. Between modern systems (RGF93, ETRS89, WGS 84) it is a few centimetres; from a legacy datum such as NTF, OSGB36 or DHDN it is about a metre, and that is the registry's limit, not the page's.
- No grid-file transformations. The NTF to RGF93 grid, the OSTN15 grid and the like need a desktop GIS. QGIS applies them on the fly.
- No heights. The third number of a line is ignored; altitude systems are a separate question.
- No MGRS, no British grid letters, no Plus Codes. Numbers only.
- A point outside the domain of the target projection is reported and left out, rather than placed somewhere wrong.
Questions people ask
- Are my coordinates sent anywhere?
- No. The conversion is proj4 running in your browser tab. The page makes no request while you use it; open the network panel to check.
- How do I convert Lambert 93 to GPS coordinates?
- Set From to RGF93 / Lambert-93, To to WGS 84, paste the X and Y in metres (X first, around 700 000; Y around 6 600 000) and convert. The result is latitude and longitude in degrees, with the degrees-minutes-seconds form next to it.
- Which number comes first?
- For degrees, the page reads latitude then longitude unless you switch the order or write N S E W letters, which decide on their own. For metres, easting (X) then northing (Y) by default. In Lambert 93 the X is always the smaller number.
- Can I convert a whole spreadsheet?
- Paste the two coordinate columns, one point per line; a header row is skipped and any third column becomes the label. Then download the CSV. A few thousand lines convert in under a second.
- Why is my result 100 to 200 metres off?
- The wrong source system, almost always: Lambert II étendu and Lambert 93 look alike but differ by hundreds of kilometres in Y, and choosing WGS 84 UTM for ETRS89 UTM coordinates shifts nothing in Europe but a metre elsewhere. Check the source, then check the axis order.
- Which UTM zone should I choose?
- Leave To on the automatic UTM entry and the page picks the zone from each point's longitude and hemisphere, showing the EPSG code it used in the last column.
Other free tools
Next, put the points on a map
Download the CSV, load it in QGIS as a delimited text layer, and the points sit on your imagery. From there the two TerraLab plugins take over: AI Segmentation detects the buildings and roads around them, AI Edit renders a project on the map.