Coordinates
Batch coordinate converter
Paste or upload a CSV, choose a conversion (including China map offsets), and download the result locally.
How to use
Use the top chips for common conversions, or open More options for the full list. One pair per line: decimal 40.71, -74.01 or DMS 40°42'46"N 74°00'22"W; also supports degrees+decimal minutes e.g. 39°54.25'N 116°23.5'E. Without headers, latitude comes first; switch to longitude-first in More options if needed. Small pastes show results automatically; for CSV uploads or more than about 50 lines, click Convert.
CSV headers may be lat/lon. Reverse UTM uses easting, northing, zone; MGRS is one grid per line. Conversion stays in the browser. GCJ-02 / BD-09 are China map offsets (not survey-grade).
If many rows fail with latitude outside ±90°, longitude is probably first — use Swap and convert. Downloads are UTF-8 CSV (BOM for Excel) or GeoJSON.
What are WGS84, GCJ-02, and BD-09?
WGS84 is the usual GPS / global datum. GCJ-02 is the China map offset used by many mainland basemaps; BD-09 is Baidu's further offset. Plotting the same numbers on the wrong map can shift points by hundreds of metres.
Is my data uploaded?
No. Parsing and conversion run entirely in your browser; files are not uploaded.
What if latitude and longitude are swapped?
If many rows fail with latitude outside ±90°, use Swap and convert, or change the default order in More options when there is no header.
Is this accurate enough for surveying?
No. Outputs are for technical reference only. For survey acceptance or construction, use licensed GIS / survey products.
How is this different from the map GCJ-02 / WGS84 tool?
This page is for batch paste and CSV. Use the map converter or map picker when you need visual offset checks or click-to-pick coordinates.