What this converts
Coordinates are written two ways. Decimal degrees look like 48.8584, 2.2945. Degrees, minutes and seconds look like 48° 51′ 30.24″ N. Paste either format above and you get both back, along with each axis on its own so you can copy just the latitude or just the longitude.
Everything runs in your browser. Nothing is sent to a server, and no API key is needed. If you have a Google Maps link instead of raw coordinates, use the Maps URL to Place ID tool.