It’s no secret that images have metadata: geolocation, the device from which the photo was taken, and so on (see EXIF, IPTC, and XMP). However, you don’t always want to share this information when sending someone an e-mail, for example.

Recently I found a free ImageOptim, which removes all this data: https://imageoptim.com

ImageOptim screenshot

More tips in an old article on CNET: https://www.cnet.com/how-to/remove-metadata-from-office-files-pdfs-and-images/