Why is AVIF encoding slow?
AVIF compression is computationally heavy — significantly more so than WebP or JPG. We use speed level 8 (libavif default is 6) to keep things responsive in a browser, trading a few percent of size for ~3× faster encoding.
Will my browser decode AVIF?
Yes — AVIF decoding is universal in modern browsers (Chrome, Edge, Firefox, Safari 16+). The encoder used here is WASM, so encoding works even on browsers without native AVIF encoding (notably Chrome on macOS).
AVIF or WebP — which should I use?
WebP for maximum compatibility (everyone supports it, all CDNs cache it). AVIF for cutting-edge size savings on hero images and large photo galleries where every kilobyte matters. Use Auto mode and the tool will pick AVIF when your browser can encode it.
Are my images uploaded to your server?
No. All images are processed locally in your browser using JavaScript and WebAssembly. Your files never leave your device, and we have no infrastructure that could receive them.
Can I compress multiple images?
Yes. You can drop a batch of images (or an entire folder) and download the compressed results as a single ZIP file with the original folder structure preserved.
Which formats are supported?
JPG, PNG, WebP and AVIF are supported when available in your browser. The Auto mode picks the smallest modern format your browser can encode.
Can I compress images to a specific size?
Yes. Use the
Compress to KB tool to target 100KB, 200KB, 500KB, 1MB or any custom size.
Do I need an account?
No. There is no signup, no login, and no payment. The tool works as soon as the page loads.