Find out who leaked it.
Give a different invisibly-watermarked copy to each person. Every copy looks identical to the original — no QR, no visible mark. When one leaks, drop it below and we'll tell you which recipient's copy escaped, with the full timestamped receipt.
Three independent invisible signals are embedded into each copy, each tuned to a different attack class:
- Direct file shares (email, AirDrop, Signal-as-document, e-discovery): the lossless LSB layer catches the leaker.
- JPEG re-compression down to quality ~40: the block-DC and DWT layers survive.
- Resize from 0.5× up to 2× (covers Instagram, WhatsApp, Twitter, Telegram, Signal's default image mode): the DWT+DCT+SVD layer survives.
- Partial crop up to ~50% of the image area removed from any single edge: the quadrant-redundant embedding keeps a recoverable copy intact.
Combined attacks recover in our synthetic 512×512 test suite, including the realistic Instagram pipeline (1200×800 PNG resized to 1080 longest edge + real JPEG q85 with chroma subsampling). Real-world content varies with image type — run the rig at /lab against your own material before treating the synthetic numbers as a guarantee. The full method is on the methodology page.
Limits we're honest about: crops > 60% (most of the image removed), rotation more than a few degrees, and adversarial-removal attacks where someone reads our open code and engineers a stripping pipeline. Those break it.
You shared a sensitive screenshot in a friend group of three. It ended up on Twitter. Mint one watermarked copy per friend before you share; when a leak shows up, drop it here and the variant id tells you which friend.
Per-subscriber watermarked copies, free, browser-only. When content leaks, the variant id points to the subscriber. No $30/mo SaaS required — full creator workflow.
Send three watermarked copies of a pitch deck to three PR firms. When the deck appears on a competitor's TikTok the next week, you know which firm to never work with again.
Mint one watermarked copy per recipient.
When one leaks — drop it here.
The watermark cannot be seen. Each copy looks pixel-identical to the original you uploaded.
LSB for lossless re-shares, block-DC for JPEG, and DWT+DCT+SVD for platform pipelines that re-encode AND resize AND partially crop.
Watermarking and detection both run in your browser. The image bytes never reach our servers — only a 32-byte hash does.
The robust layer is a browser-side port of the ShieldMnt invisible-watermark algorithm (DWT+DCT+SVD on the chroma channel), patched with quadrant redundancy and a CRC-validated recovery search. Read the methodology for the algorithm and the empirical robustness numbers.