Search for an EPSG coordinate system and transform survey coordinates between CRSs using the MapTiler Coordinates API, the current replacement for the deprecated epsg.io search/transform API
domain: api.maptiler.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Register a free MapTiler account and generate an API key; the legacy epsg.io search/transform endpoints were sunset February 1, 2025 and now require this key
Search for a coordinate system: GET api.maptiler.com/coordinates/search/<query>.json?key=YOUR_KEY (e.g., search a state plane zone name to find its EPSG code)
Transform coordinates: GET api.maptiler.com/coordinates/transform/<x>,<y>.json?s_srs=<source_epsg>&t_srs=<target_epsg>&key=YOUR_KEY
For batch transforms, separate multiple coordinate pairs with semicolons in a single transform request
Pass exports=true on search requests if you need proj4/WKT strings to configure CAD/GIS software with the resulting CRS definition
Known gotchas
Any code or documentation referencing the old epsg.io/trans or epsg.io/?q= endpoints is stale; those were fully retired and all traffic now requires a MapTiler key
Response schema changed materially from the old API (number_result renamed to total, code nested under id, bbox axis order changed) — old parsing code breaks silently on the new field layout
Static per-code definition download links like epsg.io/<code>.proj4 still work unchanged, but that legacy behavior does not extend to the deprecated search/transform endpoints
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