Which quality setting should I use?

For JPEG and WebP, 75 to 85 is the usual sweet spot: most of the file size gone, differences invisible at normal viewing distance. Below about 60 you start to see blocking in flat areas and haloes around edges.

Which codec gives the smallest file?

AVIF is typically smallest, then WebP, then JPEG, at matched quality. AVIF also encodes slowest. For a photo on a modern website WebP is the pragmatic default; keep JPEG when the image must open in old software.

Is compression lossless?

For PNG via oxipng, yes — the pixels are identical and only the encoding is optimised. For JPEG, WebP and AVIF at a quality setting it is lossy: information is discarded to save space, and re-compressing an already-compressed image repeatedly will visibly degrade it.

Compress Image

Reduce image file size using WebP, AVIF, or JPEG compression. All processing happens in your browser.

Drop files here or click to upload

.jpg, .jpeg, .png, .webp, .gif, .bmp · Max 20 files

Or paste files with Ctrl+V

Your files never leave your browser

What is Image Compress?

Image Compress reduces image file size using state-of-the-art codecs (MozJPEG for JPG, oxipng / pngquant for PNG, WebP and AVIF). All encoding runs as Squoosh WASM in your browser.

How to use Image Compress

Drop one or more images (JPG / PNG / WebP / GIF / BMP).
Choose target codec and quality.
Click "Compress" — Squoosh re-encodes each image.
Compare original vs compressed and download.

Why use AinnoBox for this

The encoders are the same ones Squoosh uses — MozJPEG, oxipng, pngquant, libwebp and AVIF — compiled to WebAssembly, so results match desktop-grade tools rather than a cheap canvas re-save.
A before-and-after size readout for every file makes it obvious when a quality step has stopped paying for itself.
Switching codec is part of the same operation, so you can discover that a PNG screenshot becomes 80 per cent smaller as WebP without a separate conversion step.
Product photos and unreleased artwork stay on your machine — a real consideration when the alternative is a free host that reserves rights over uploads.
Batch processing, no file count limit, no sign-up and no watermark burnt into your images.

Image Compress — frequently asked questions

Which quality setting should I use?: For JPEG and WebP, 75 to 85 is the usual sweet spot: most of the file size gone, differences invisible at normal viewing distance. Below about 60 you start to see blocking in flat areas and haloes around edges.
Which codec gives the smallest file?: AVIF is typically smallest, then WebP, then JPEG, at matched quality. AVIF also encodes slowest. For a photo on a modern website WebP is the pragmatic default; keep JPEG when the image must open in old software.
Is compression lossless?: For PNG via oxipng, yes — the pixels are identical and only the encoding is optimised. For JPEG, WebP and AVIF at a quality setting it is lossy: information is discarded to save space, and re-compressing an already-compressed image repeatedly will visibly degrade it.

Want to understand why AinnoBox processes everything in the browser rather than on servers? Read How It Works or check the FAQ.