WGS84 to ETRS89 UTM 31N Coordinate Converter
Free online tool to convert coordinates from World Geodetic System 1984 (lat/lng) (EPSG:4326) to ETRS89 / UTM zone 31N (Spain east) (EPSG:25831). Professional-grade accuracy using proj4, zero install, runs in your browser.
About WGS84
World Geodetic System 1984 (lat/lng) (EPSG:4326). The global reference system used by GPS, Google Maps and virtually all modern navigation. Defined by satellite geodesy and continuously refined.
About ETRS89 UTM 31N
ETRS89 / UTM zone 31N (Spain east) (EPSG:25831). Spanish eastern regions including Catalonia, Valencia, Baleares. Shared with France for border areas.
Frequently Asked Questions
What is the difference between WGS84 and ETRS89 UTM 31N?
WGS84 (EPSG:4326) is geographic and based in Global, while ETRS89 UTM 31N (EPSG:25831) is utm based in Spain. The global reference system used by GPS, Google Maps and virtually all modern navigation. Defined by satellite geodesy and continuously refined. In contrast, spanish eastern regions including catalonia, valencia, baleares. shared with france for border areas.
Is this conversion accurate for surveying?
Yes. The conversion uses the industry-standard proj4 library with full datum shift parameters (). Typical accuracy is sub-meter for civilian applications. For cadastral precision, always verify against the official agency datum.
What coordinate format should I use?
For WGS84, enter coordinates as decimal degrees in the format "lat, lng" (e.g. 45.4642, 9.1900). The tool auto-detects the format.
Can I convert many points at once?
Yes, use our batch CSV converter. Upload a CSV with your points, select the transformation, download the converted file. Free with a SurveyingPedia account.
Is there an API?
Yes — call /api/v1/transform?from=EPSG:4326&to=EPSG:25831&coords=lat,lng for programmatic access. It returns the transformed coordinates as JSON.