Read what's inside an image file.
Sometimes you don't want to change the image — you want to know what's in it. EXIF Viewer reads camera metadata: model, lens, GPS coordinates, timestamps. Image Color Picker samples colors to a HEX palette. Image to Base64 inlines the binary into a data URI for embedding in CSS or HTML. All three operate on the file you drag in; nothing uploads.
Usually no. GPS and timestamps reveal more than most posters realize.
Tiny icons or one-off email templates. Beyond a few KB you lose caching benefits.