Markedfile

Markedfile adds an invisible mark, unique to each recipient, to your images, PDFs and videos. If a copy leaks, even as a cropped screenshot, upload it and see whose copy it was, with a confidence score. Free plan, no card needed. Detection is not guaranteed: very small crops (roughly under 256 px of a detailed area) may not be detected, and images under 96×96 px are rejected.