About PicBrewery - image optimizer and converter
PicBrewery - image optimizer and converter is a free, open tool that compresses and converts images entirely inside your browser. Your images are never uploaded — they stay on your device.
What it is
PicBrewery - image optimizer and converter is a one-page web application for optimizing photos and graphics. Drop in JPG, PNG, WebP, AVIF or BMP files and get compressed variants in all four modern formats side-by-side — so you can pick the smallest one that still looks right. Batch size is up to 20 files at 20 MB each, with two concurrent encodes to keep your laptop responsive.
How it works
PicBrewery - image optimizer and converter runs production-grade image codecs compiled to WebAssembly, executed inside Web Workers so the UI stays responsive. The same libraries that power native desktop tools are doing the heavy lifting — only the glue is JavaScript.
- JPEG — MozJPEG, the reference high-quality JPEG encoder.
- PNG — oxipng (Rust), a lossless PNG optimizer.
- WebP — libwebp from Google, both lossy and lossless.
- AVIF — libavif with the AOM AV1 encoder — the current state of the art for photo compression.
When you drop files, decoding and re-encoding happens entirely on your
device. The OffscreenCanvas API and typed arrays move pixel data
around with minimal copying. The finished blobs go straight into a download
link or a ZIP archive built in the browser with
fflate.
Privacy
Image processing is 100% client-side. Your files are decoded, re-encoded and zipped entirely inside your browser — they are never uploaded to any server, and the codec binaries are static assets. Once loaded, PicBrewery works offline.
The website itself uses privacy-respecting analytics (Google Analytics 4 and Yandex.Metrika) and may show ads (Google AdSense and the Yandex Advertising Network) to keep the project free. None of these are loaded until you opt in via the cookie banner — you can accept, reject or adjust your choice any time from the Privacy Policy page or the "Cookie settings" link in the footer.
Your preferences (theme, advanced codec settings) are saved to
localStorage on your device so they survive reloads.
Browser support
Requires a modern browser with WebAssembly, Web Workers and
OffscreenCanvas — Chrome 90+, Firefox 90+ and Safari 15+.
Older browsers see an explicit incompatibility screen.
Learn more
If you want to go deeper into image formats, start with our Image formats comparison — a practical guide to JPEG, PNG, WebP and AVIF — or open PicBrewery - image optimizer and converter.
Ready to optimize?
Drop your images into PicBrewery - image optimizer and converter. Everything stays on your device.