What your photo says about you
Phones and cameras write hidden notes into every photo. Open a JPG, PNG or WebP to read them all, then remove what you don't want to share. The picture itself is never re-compressed.
Metadata isn't one thing. EXIF is a little TIFF file tucked inside the photo; XMP is XML; IPTC is a newsroom format from the 1990s; PNG has its own text chunks. This page reads and rewrites every block in the right-hand list, and leaves the picture data untouched.
Sharing sites often strip metadata on upload, but messaging apps sending "as a file", email attachments and cloud links usually keep all of it.