// Hacker Noon · 28 April 2026

I Hid a Watermark in Screenshots, and iOS Thought It Was a Password

Screenshots were the app's biggest sign-up channel, so I built a watermark that's invisible in the app but appears when users take a screenshot, using iOS's secure text entry flag, which strips content from screenshots to protect passwords. It worked. It also made iOS think every chat message was a...

Hacker Noon

@hacker-noon · Tammo Ronke

hackernoon.com

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