Hey , I totally get your concern—honestly, I had the same reaction the first time I came across Undress.app. I played around with it a few weeks ago for an art concept and was super cautious with what I uploaded. According to their FAQ and what I could gather while digging through some privacy notes, they claim that images are processed in real time and not stored afterward. But here’s the catch: they don’t provide super detailed transparency around their backend processing, which I find a bit unsettling.
I ended up switching to another version they’re connected with—drawnudes—because it seemed to have a more stripped-down, focused tool that was easier to test safely with some dummy photos. I didn’t notice any watermarking or obvious server lag, which usually hints at client-side processing, but I can't confirm that with certainty.
My personal rule is to never upload real people’s photos unless they’re 100% public domain or AI-generated models. And I use VPN + incognito mode, just to be safe. Would be great if they’d publish a data handling audit or something—until then, I treat every upload as disposable.