EXIF is written by the camera or phone at capture time: which device took the picture, with which lens and settings, at exactly what moment — and sometimes where. That is a gift for photographers auditing their technique or archivists identifying unknown hardware, and a liability for anyone sharing photos publicly, because the same rows can hand over a home address or a running route. Screenshots, PNGs and images that have been through a social network are usually clean already; JPEGs straight from the camera rarely are. A file with nothing to show reports that honestly instead of guessing.
This tool reads; Remove Image Metadata writes. The natural workflow is inspect first — confirm what is actually attached to a specific photo — then run that file through the remover before it goes online. Parsing uses a client-side library, so the photo itself is never uploaded anywhere; the preview is a local object URL that disappears when you clear the file. It is the quickest answer to “what is hidden in this image?”.
Also useful: Remove Image Metadata (EXIF), Image Compressor, and Image Format Converter.