How it works: Images are decoded and re-encoded entirely in your browser using the Canvas API (and a bundled decoder for HEIC/HEIF). Nothing is ever sent to a server.
Honesty note: This is a utility, not an AI-advisor app — there is no live AI feature here, so AI Provider Sovereignty does not apply. "Lossless" mode is near-lossless for formats without a true lossless path (e.g. standard JPEG); WebP and PNG offer genuine lossless options where selected. HEIC/HEIF decoding uses a small open-source library (MIT) that ships inside the app and loads from this same address only when you add a HEIC file. Nothing is fetched from another site, and everything, including HEIC, works offline once the app has loaded one time.
Install the app
Open this page in Chrome or Safari first. This browser is inside another app, which cannot install apps. Copy the link, then paste it into Chrome (Android, computer) or Safari (iPhone).
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Android ChromeMenu, then Install app
Samsung InternetMenu, then Add page to, then Home screen
Firefox (Android)Menu, then Install
iPhone SafariShare button, then Add to Home Screen
ComputerInstall icon in the address bar, or menu, then Install
Nothing shows up? Check the address starts with https://, reload once, wait about ten seconds, then try the menu again.