Hider

Uploading sensitive images to the cloud to encrypt them recreates the very risk you wanted to avoid. Hider sends the image nowhere: it scrambles the pixels on your device, in an order derived from your password. The program contains no networking code at all.

The method is built on SHA-256: the password is hashed, and the scramble order is derived from that hash. A wrong password raises no error; it simply produces a different scramble. The same image can be scrambled again and again with different passwords; decrypting goes in reverse order.

Multiple images are processed in a batch by drag and drop (all with the same password). You can overwrite the original or save a copy. PNG and WEBP keep their format; JPEG is saved as PNG so nothing is lost. If the image’s pixel size changes, it can never be decrypted again; the app explains this up front.

The Windows and Android editions use the same method; the product page is at encryptimages.com.