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Free Online CRS / SRS Detector

Upload a GIS file to instantly detect its Coordinate Reference System (CRS) or Spatial Reference System (SRS). Supports Shapefile, GeoJSON, GeoPackage, GeoTIFF, and more. All processing is local — your file never leaves your browser.

What this tool does

Reads the CRS metadata from your GIS file and displays the projection name, EPSG code, well-known text (WKT) definition, and geographic extent.

Supported file types

Shapefile (.prj), GeoJSON (if CRS is embedded), GeoPackage (.gpkg), GeoTIFF (.tif/.tiff), FileGDB, and more.

Why CRS matters

Mismatched CRS is the most common cause of misaligned layers in GIS. Identifying the CRS early prevents data integration problems.

How to use

Drag and drop your file onto the detector or use the file picker. The CRS information is displayed in seconds.

Privacy

Files are processed entirely in your browser. No upload means your data stays private.

Common EPSG codes

EPSG:4326 (WGS84 lat/lng), EPSG:3857 (Web Mercator), EPSG:4269 (NAD83), EPSG:26910-26920 (UTM zones), EPSG:27700 (OSGB British National Grid).

Frequently Asked Questions

What is a CRS?
A Coordinate Reference System defines how geographic coordinates map to locations on Earth. It includes a datum, projection, and coordinate system.
How do I find the EPSG code of a Shapefile?
Drop the .prj sidecar file onto this tool. It reads the WKT definition and matches it to the EPSG database.
Can I detect the CRS of a GeoJSON file?
GeoJSON files typically use WGS84 (EPSG:4326) by default. Some files embed CRS information — this tool can read it if present.
Why are my GIS layers not aligning?
The most common cause is mismatched CRS between layers. Use this detector to verify each layer's projection and reproject as needed.