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It writes who the copy is for and why across the page, for example “Copy for Mark & Co. Realty · Lease application · 13 Nov 2026”. A copy that turns up somewhere else shows where it came from, and it is of little use for anything but what you sent it for.

No watermark is impossible to remove. Harder to remove adds grain, small colour variations and distortion, which raise the cost of removing a stamp automatically. It is a switch on the Stamp panel of each copy.

Only on your device, in WaterTight’s vault. There is no account and no cloud, and the app has no network access. iOS encrypts the vault with your device passcode; without a passcode it is not encrypted.

JPEG, HEIC, PNG and PDF, including password-protected PDFs, from Files, Photos or the share sheet. A card can have its back, and a passport its visa or signature pages.

Open a document, tap Make a copy, fill in To and For, and tap Make copy. The copy is kept under the document. When you are ready, tap Send… on the copy’s screen and choose Messages, Mail, AirDrop, Files, Photos or another app. Each time a copy goes out, the copy records to whom, when and by which route.

Yes, unless you turn on Settings › Keep out of backups. An iCloud backup is encrypted, but Apple holds the key unless you turn on Advanced Data Protection; keep computer backups encrypted too.

Your device passcode always opens the vault. You can turn the lock off under Settings › Privacy.

Settings › Clear All Data removes every document, copy and record after you confirm with Face ID or Touch ID. Deleting the app removes everything too.