Your images never leave your device. Not as a policy we ask you to trust, but as a physical property of how this site is engineered.
Compress Image is engineered on WebAssembly, a low-level binary instruction format executed inside your browser's security sandbox. The same industrial-grade codecs that power professional imaging software, MozJPEG, libwebp, OxiPNG, libheif and libavif, are compiled from their native C and Rust source into portable machine code and delivered to your browser, where they run at near-native speed on your own processor.
When you drop an image onto one of our tools, the file is read directly into your device's memory, decoded, dispatched to an isolated worker thread, and re-encoded, without a single byte of image data traversing the network. There is no upload endpoint, no ingestion pipeline, no server-side processing queue. The infrastructure required to receive your image simply does not exist here, which means a data breach, a subpoena or a rogue employee cannot expose what was never collected in the first place.
Security engineers call this a zero-knowledge architecture: the system is constructed so that we are incapable of seeing your data, rather than merely promising not to look.
A claim like this should be verifiable, so verify it. Open your browser's developer tools (press F12), switch to the Network panel, and compress an image. You will see the codec engines download once and get cached, and you will see your image go nowhere. That panel is the same instrument security researchers use to audit websites, and it does not lie.
That's the promise, and the architecture keeps it for us. Built in Canada.