Compressa by Rabbit Builds
NewAVIF & JPEG XL encoding, right in your browser

Smaller images.
Zero compromise.

Compressa is a professional image optimiser that runs entirely on your device. Compare codecs side by side, tune every setting, and ship images up to 90% lighter.

  • No sign-up
  • No uploads
  • Works offline
compressa.app
Or try a sample
Smaller files
up to 90%
Codecs built in
10
Bytes uploaded
0
Powered by
WebAssembly

Features

Everything you need to ship lighter images

Built for developers, designers and teams who care about performance — without trading away quality or privacy.

Side-by-side comparison

Drag the split view to inspect the original and compressed output pixel-for-pixel. Zoom, pan and rotate in sync, then tweak settings until it’s perfect.

Private by design

Processing happens 100% on-device. No servers, no tracking of your files, no retention policies to worry about.

Native-speed codecs

Industry-standard encoders compiled to WebAssembly and run in background workers, so the UI stays responsive.

Resize & reduce palette

High-quality resampling (Lanczos, Mitchell, Catmull-Rom) and palette quantisation for pixel-perfect assets.

Expert-level control

Quality, effort, chroma subsampling, sharpness and more. Save presets per side and reuse them across images.

Offline & installable

Install Compressa as an app on desktop or mobile. Once loaded, it keeps working without a connection.

Formats

Every modern codec, one tool

Pick the right format for the job and see the trade-offs instantly.

  • AVIFNext-gen, best-in-class ratios
  • WebPUniversal modern format
  • JPEG XLHigh-fidelity successor to JPEG
  • MozJPEGSmarter, smaller classic JPEG
  • OxiPNGLossless PNG optimisation
  • WebP v2Experimental successor to WebP
  • QOIFast, simple lossless format
  • BrowserNative PNG, JPEG & GIF

How it works

Optimised in three steps

  1. 01

    Add an image

    Drag and drop, paste from your clipboard, or pick a file from your device.

  2. 02

    Compare & tune

    Choose a codec for each side, adjust quality, and preview the result live.

  3. 03

    Download

    Save the optimised file instantly — it never left your device in the first place.

FAQ

Questions, answered

Can’t find what you’re looking for? The source code is open on GitHub.

Are my images uploaded to a server?

No. Every decode, resize and encode runs locally in your browser using WebAssembly. Your files never leave your device, which makes Compressa safe for confidential and client work.

Which format should I choose?

For photos on the web, AVIF or WebP usually deliver the smallest files at the same visual quality. Use MozJPEG when you need maximum compatibility, and OxiPNG for lossless graphics, screenshots and UI assets.

Is Compressa really free?

Yes. There is no account, no watermark and no file limit. Compressa is built on the open-source Squoosh project and released under the Apache 2.0 licence.

Does it work offline?

Yes. After your first visit, Compressa is cached and works without a connection. You can also install it as an app on desktop and mobile.

Ready to make your images lighter?

Free, fast and private. No account required.