Perceptual fingerprint
What it is
A compact description of what an image looks like, rather than its exact bytes.
What it does
Helps recognize visually related versions — resized, compressed, mildly cropped — even when the exact file has changed.
What it doesn't do
It cannot prove two images are copies, only that they are visually similar. Strong edits can defeat it.
What changes it can survive
Resizing, compression, and mild cropping. Not heavy alteration.
When we recommend it
Always, alongside a hash. It’s what makes later searching and comparison possible.
Does your original leave your device?
No. Computed in your browser from the image.
Is an external provider involved?
No.
Can you verify it without us?
Partially. You can compare fingerprints yourself, but large-scale search needs a matching service.