Remove all metadata in one step
Remove all metadata is ticked by default. It deletes every EXIF tag, including exposure settings, ISO, focal length and the orientation tag, along with XMP, comments and PNG text chunks. Because the orientation tag goes too, the pixels are rotated first, so a phone photo that relied on that tag still displays the right way up everywhere.
Two things are kept on purpose: the ICC color profile and the DPI value. They affect how the image looks on screen and how large it prints, and they say nothing about you, where you were or what you used.
Or choose which groups to remove
Untick Remove all metadata to pick groups instead. Each is listed with the value currently stored in your file. GPS location removes the whole GPS block: coordinates, altitude, direction and GPS timestamps. Camera & lens removes the make and model, owner name, body and lens serial numbers, lens details and maker notes. Date taken removes the capture, digitized and modified times with their time zone offsets. Software removes the editing app, processing software and host computer name.
Everything else in the EXIF stays, including exposure settings and the orientation tag, so the pixels are not rotated. XMP is always removed in this mode, because it can repeat location, camera and date details in a form that can't be edited selectively. Either way, the small embedded preview thumbnail some cameras store is always removed, since it can show the original framing even after a crop.
Quality of the cleaned file
PNG files are re-saved losslessly. JPEG files are re-saved at quality 95 with the original chroma subsampling, which is very hard to tell apart from the original. WebP stays lossless if it was lossless, and is saved at quality 95 otherwise. HEIC, TIFF and other formats come back as JPEG, or PNG when they have transparency. The download is named with -clean added.