Most photos from a phone or camera carry hidden EXIF metadata: the camera model, the date taken, and often the exact GPS coordinates of where it was shot. EXIF Remover shows you what's embedded in a photo, then strips it so you can share the photo without sharing that information too.
It redraws the image onto a blank canvas and re-encodes it from scratch. EXIF metadata lives in a separate segment of the original file that the canvas never reads or recreates, so the output file simply doesn't have one.
EXIF metadata, including GPS location, is almost always stored in JPEG files, since that's what phone and camera photos are saved as. PNG and WEBP rarely carry it. Strip Metadata still re-encodes any image format to be sure.
Re-encoding uses a high quality setting, so any difference is negligible for sharing purposes. It isn't a lossless operation like a true metadata-only strip would be, but it's visually indistinguishable from the original.
No. Reading the metadata and re-encoding the photo both happen locally in your browser. Nothing is sent to a server.