Convert Web Mercator to Lat/Long

Revert EPSG:3857 (Web Mercator) meters back to GPS-ready Latitude and Longitude.

How to Use

Enter X and Y coordinates in meters.

Online Tool

Input: EPSG:3857

Output: WGS84

X (Meters): Y (Meters):

⚠️ Datum Hazard: Read Before Conversion

Coordinate values only have meaning when attached to a Datum.

WGS84: Standard for GPS, Google Maps, Web Mercator.
NAD27: Used in older USGS topographic maps (pre-1983).

Using the wrong datum can shift your position by 20-100+ meters. Always verify the source datum of your coordinates.

Use Cases

Debugging map tile coordinates.
Extracting location data from map databases.

FAQ

Q: Is this WGS84?

A: Yes, the output is WGS84 Latitude/Longitude.

Q: What are the units?

A: Input must be in meters.

Q: Why is the latitude limit 85 degrees?

A: Because Web Mercator math fails at 90 degrees (infinity).

Professional Verification Disclaimer

This content is provided for decision-support and educational purposes for geospatial professionals and does not constitute legal, surveying, or engineering advice. Regulations and official standards vary by jurisdiction and project scope. Information is based on publicly available standards as of January 11, 2026. For critical projects, always verify current requirements with:

Licensed Professional Surveyors or Professional Engineers (PE) in the relevant jurisdiction
Certified attorneys for legal interpretation of regulations
Current guidelines from relevant authorities (FAA, JCAB, GSI, etc.)

Reference: Professional Use & Scope

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