Coordinate Format Converter
Convert GPS coordinates between decimal degrees, DMS, DDM and GeoJSON instantly. Auto-detects the input format, handles N/S/E/W hemispheres, and exports batches as CSV — fully offline in your browser.
Which coordinate formats can it read?
It auto-detects decimal degrees (DD) like 40.7128, -74.0060, degrees-minutes-seconds (DMS) like 40° 42' 46.08" N, degrees and decimal minutes (DDM) like 40° 42.768' N, and GeoJSON arrays written as [-74.0060, 40.7128].
Why does GeoJSON order matter?
Plain coordinates are written latitude first, but GeoJSON uses the reversed [longitude, latitude] order. The converter treats bracketed pairs as GeoJSON, so the two values are never swapped by mistake.
How do the N/S/E/W letters work?
The hemisphere letter overrides the sign: N and E force a positive value, S and W force a negative one. You can write the letter before or after the numbers, with or without the degree, minute and second symbols.
How precise are the converted values?
Decimal degrees are shown to six decimals (about 0.1 m at the equator), DMS seconds and DDM minutes carry two and three decimals respectively, which is finer than most GPS receivers report.
How does batch mode work?
Open the Batch tab and enter one coordinate per line. Each line is parsed separately, valid ones fill the table with all formats, and unparsable lines are flagged in the Status column with the line number so you can fix just those.
Can I export the results?
Yes. After parsing a batch list, press Export CSV to download a spreadsheet with the original input, latitude, longitude, DDM, DMS and GeoJSON columns, ready for Excel or Google Sheets.
Can I enter degrees, minutes and seconds in separate boxes?
Yes. Below the main input there are dedicated deg/min/sec fields for latitude and longitude, each with a N/S or E/W selector. The outputs and the main input stay in sync as you type.
Is anything uploaded to a server?
No. Parsing, conversion and CSV export all run locally in your browser with JavaScript. Coordinates, batch lists and results never leave your device and no account is needed.
How to Use Coordinate Format Converter
This converter reads a coordinate written in almost any common notation — decimal degrees (DD), degrees-minutes-seconds (DMS), degrees and decimal minutes (DDM) or a GeoJSON [longitude, latitude] array — and instantly shows the same point in all of the other formats. It also accepts a list of coordinates in batch mode and exports the whole set as CSV. Everything is computed locally in your browser; no coordinate ever leaves your device.
- Switch between the Single and Batch tabs depending on whether you have one coordinate or a whole list.
- In Single mode paste a coordinate into the input box, for example 40.7128, -74.0060 or 40° 42' 46.08" N, 74° 0' 21.6" W — the detected format appears under the input.
- All four result cards (DD, DMS, DDM and GeoJSON) update live; press Copy on a card to put that representation on the clipboard.
- Prefer typing the fields separately? Fill the latitude and longitude deg/min/sec boxes with their N/S or E/W selector and the outputs follow along.
- In Batch mode enter one coordinate per line, then use Export CSV to download a spreadsheet with latitude, longitude and every format as columns. Lines that cannot be parsed are flagged in the Status column with the line number.
Latitude always comes first and longitude second, but GeoJSON uses the reverse order [longitude, latitude] — the tool converts automatically, so a GeoJSON array will not be misread. Hemisphere letters N/S/E/W win over a minus sign, and decimal points must be dots, not commas.
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