RetouchPi is a full photo studio in your browser: 52 tools, layers and masks, PSD round-trip, portrait retouching and ID photos. No download, no account, no upload - photos are decoded, edited and exported on your own device, so nothing leaves your machine. Exports carry no watermark, and the editor is free. Under the hood: a Rust/WASM core with a real layer stack (groups, masks, clipping masks, adjustment layers, 10 layer styles) and a history panel that keeps your selection on undo.