Image redaction
Also known as: redact image, blur out sensitive info, hide info in photo
Image redaction permanently hides sensitive information in a photo or screenshot — names, account numbers, faces, addresses — by covering it and flattening the result so the hidden data cannot be recovered. Done correctly, the original pixels are destroyed, not just visually masked.
- Must flatten or delete the hidden pixels, not just cover them
- A baked-in black box is safer than blur for sensitive text
- Strip EXIF metadata so GPS and device data don’t leak
Cover is not the same as remove
The common mistake is drawing a box or blur over private data and saving in a way that keeps the original underneath. Layered editors, lightly blurred regions, and movable shapes can all leak the hidden content. True redaction must flatten or delete the underlying pixels, so what is covered is genuinely gone.
A solid box that is baked into the image is the safest method. Heavy blur or pixelation can sometimes be reversed for text and patterns, so a black box beats a blur for anything truly sensitive.
Don’t forget metadata
Visible pixels are only half the risk. A photo can still carry EXIF metadata — GPS coordinates, device, and timestamp. After redacting the image, strip its metadata too so location and camera details do not travel with the file.