Tiles and quadkeys
Web maps are cut into 256-pixel tiles in the Web Mercator projection. At zoom z the world is 2^z tiles wide; a tile is named z/x/y, with x counted from 180° W and y from the top (85.05° N). OpenStreetMap, Google and most libraries use this scheme; Bing writes the same tile as a quadkey, one digit (0–3) per zoom level.
The converter shows the zoom-18 tile (about 150 m at the equator) and its quadkey, using the formulas of the OpenStreetMap wiki and Microsoft's Bing Maps Tile System, checked against their published examples. Paste a tile URL, z/x/y or a quadkey to see the tile centre.
Frequently asked questions
Is the y tile number the same in TMS?
No. TMS counts y from the bottom: y(TMS) = 2^z − 1 − y. The converter uses the XYZ (Google/OSM) convention.
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