About picture-zip
A free, privacy-first image compressor that runs entirely in your browser.
Why picture-zip?
Most online image tools upload your files to a server, cap you at 20 images, and bury the tool under ads. picture-zip is different: every byte is processed locally in your browser using WebAssembly. Your images never leave your device.
What it does
- Batch compress and convert JPEG, PNG, WebP, AVIF and GIF
- Compress to an exact target file size (e.g. ≤ 100 KB)
- Preserve transparency when converting PNG to WebP
- Download everything as a ZIP in one click
- Works in Chinese and English, with more coming
How it works
picture-zip uses the same open-source codecs that power Google's Squoosh (MozJPEG, OxiPNG, libwebp, libavif), compiled to WebAssembly and run inside Web Workers so your UI never freezes.