CRS Detector
Detect the coordinate reference system of a GeoTIFF file by brute-force matching and visual verification.
100% Client-side Processing
No File Upload to Server
Handles Files of Any Size
How to Detect a CRS
1
Upload your GeoTIFF
Drag and drop your .tif file (with an optional .tfw world file) onto the upload area.
2
Select a recognizable region
Click to drop points and outline an area with distinctive features such as roads, rivers, or buildings.
3
Verify on the map
Browse candidate EPSG codes and check whether the image aligns with the OSM basemap.
4
Copy your result
Once confirmed, copy the EPSG code, CRS name, or Proj4 definition.
FAQ
How does CRS detection work?
What if my TIF already has CRS information?
Is my data sent to a server?
Can it handle large files (multiple GB)?
Why do I need to select a region?