EPSG Code Finder — Find Coordinate System SRID
Search coordinate reference systems by EPSG code, projection name or region; 200+ CRS database.
Related Tools
What Is an EPSG Code and Why Does It Matter?
An EPSG code is a numeric identifier that precisely specifies a coordinate reference system (CRS) — the framework that defines how coordinates on a map relate to real positions on Earth. The EPSG registry, now maintained by the International Association of Oil and Gas Producers (IOGP), contains thousands of entries covering geographic systems, projected systems, vertical datums, and transformations.
Knowing the correct EPSG code is essential whenever you import, export, or transform spatial data. A mismatch in coordinate systems causes layers to appear in the wrong location, measurements to be inaccurate, and data to be unusable in GIS software or spatial databases. Using the EPSG code as a shared reference eliminates ambiguity between teams and software platforms.
Common Use Cases
- GIS project setup: Identify the national or regional projection for a country — for example, the Turkish national grid or a UTM zone — before loading survey data.
- Spatial database queries: Pass the SRID (which matches the EPSG code) to PostGIS or SQL Server functions like ST_Transform to reproject geometries accurately.
- Data exchange: Include the EPSG code in metadata when sharing GeoJSON, Shapefile, or WKT data so recipients know the coordinate system without guessing.
- ArcGIS workflows: Search by EPSG number when assigning coordinate systems to feature classes, rasters, or map frames to ensure correct alignment.
How to Use This Tool
Type any EPSG code number, projection name, datum name, or country/region into the search box. Results update instantly as you type. Each result card shows the full CRS name, the EPSG code, the coordinate system type (geographic or projected), the datum, and the applicable area of use. Click a result to see its full WKT definition and PROJ string.
Geographic vs. Projected Systems
Geographic coordinate systems like EPSG:4326 (WGS 84) express positions as latitude and longitude angles — suitable for GPS data, GeoJSON, and global datasets. Projected systems like EPSG:32636 (UTM Zone 36N) flatten the Earth onto a plane and express coordinates in meters, making them necessary for accurate distance and area calculations in regional or local GIS work.
Other Tools
Once you know your EPSG code, you can use the Coordinate Converter to transform coordinates between systems, or the UTM Zone Finder to determine the correct UTM zone and its EPSG code for any location. The ED50 ↔ WGS84 Datum Converter is useful for working with older European survey data.
Frequently Asked Questions
What is an EPSG code?
An EPSG code is a numeric identifier assigned by the EPSG registry to a specific coordinate reference system (CRS). Each code uniquely identifies a geographic or projected CRS, a datum, a projection, or a coordinate operation. For example, EPSG:4326 is WGS 84 geographic coordinates, and EPSG:32633 is UTM Zone 33N on the WGS 84 datum.
What is the difference between EPSG code and SRID?
SRID stands for Spatial Reference ID and is used by spatial databases such as PostGIS and SQL Server to identify coordinate systems. In practice, SRIDs are usually the same numbers as EPSG codes — for example, SRID 4326 and EPSG:4326 both refer to WGS 84. The terms are often used interchangeably in GIS software and spatial SQL queries.
How do I find the right EPSG code for my country or region?
Type the country name, region name, or projection name into the search box. For example, searching "Turkey" returns common Turkish national projections such as EPSG:5254 (TUREF / TM33). Searching "UTM" lists all UTM zone projections. You can also search directly by EPSG number if you already know it.
What is the most common EPSG code?
EPSG:4326 (WGS 84) is the most widely used geographic coordinate system in the world. It is used by GPS devices, GeoJSON, and most web mapping APIs. EPSG:3857 (Web Mercator) is used as the display projection by most web tile services and online map platforms.
What is the difference between a geographic and a projected CRS?
A geographic coordinate reference system (e.g. EPSG:4326) expresses positions as latitude and longitude angles on an ellipsoid. A projected CRS (e.g. EPSG:32636 UTM Zone 36N) uses a mathematical projection to represent the curved surface on a flat plane, producing coordinates in meters or feet. Projected systems are needed for accurate distance and area measurements.
Why does ArcGIS show a different coordinate system name than the EPSG code?
ArcGIS uses its own Well-Known Text (WKT) names and Authority strings internally but supports EPSG codes for import and export. The underlying coordinate system is the same — ArcGIS simply uses longer descriptive names. When sharing data between software, using the EPSG code is the safest way to ensure correct coordinate system identification.
How do I use an EPSG code in a GIS project?
In ArcGIS, you can search for a coordinate system by EPSG code when setting the project or layer CRS. In spatial databases like PostGIS, you pass the SRID number to geometry functions such as ST_Transform(geom, 4326). In most GIS workflows, knowing the correct EPSG code ensures that layers align properly when overlaid and that distance or area calculations use the right units.
Most Used EPSG Codes for Turkey
| EPSG | System | Use |
|---|---|---|
| 4326 | WGS 84 (geographic) | GPS, global standard |
| 3857 | Web Mercator | Google/OSM web maps |
| 5253–5259 | ITRF96 / TM (3°) | Turkey official 3° zones (TM27–TM45) |
| 32635–32637 | WGS84 / UTM 35N–37N | 6° UTM zones (west/central/east) |
| 23035–23037 | ED50 / UTM 35N–37N | Legacy maps (European Datum 1950) |
| 5270–5275 | TUREF / TM–UTM | Current national reference (TUREF) |
To transform a coordinate between these systems use the Coordinate Converter, or type a system name, region or EPSG number in the search box above.