About Krunkit
Crunch your files, not your time.
Our Mission
Krunkit is a free online image tool suite that lets you compress, convert, resize, and remove backgrounds from images — individually or in batches of up to 10 — without uploading them anywhere. Every operation runs directly in your browser using WebAssembly — the same technology that powers modern web applications.
We built Krunkit because existing image tools either require uploads to remote servers (privacy risk), charge subscriptions for basic features, or install desktop software. We believed there was a better way: bring professional-grade image codecs to the browser and let your device do the work.
What We Believe
Privacy by Design
Your images are processed entirely in your browser using WebAssembly. They never leave your device — we can't see them, and we don't want to.
Performance First
We use the same codecs that power the biggest platforms — mozjpeg, oxipng, libwebp, and libavif — compiled to WebAssembly for near-native speed.
Free for Everyone
No sign-ups, no subscriptions, no watermarks, no file limits. Because client-side processing means zero server costs, we can keep Krunkit free forever.
Technology
Krunkit is built with Next.js and TypeScript, and uses jSquash — an open-source collection of image codecs compiled to WebAssembly. The codecs include:
- mozjpeg — Mozilla's optimized JPEG encoder
- oxipng — Rust-based PNG optimizer
- libwebp — Google's WebP codec
- libavif — AV1 Image File Format codec
All processing runs on the main thread or in Web Workers within your browser tab. No data is transmitted to any server at any point.
Ready to crunch?
Try Krunkit now — no sign-up required.