Squoosh
Open SourceFree open-source browser app that compresses and converts images with codecs like MozJPEG, WebP, and AVIF, all processed locally.
✨ Key Features
Side-by-side before and after comparison
Modern codecs including AVIF, WebP, and JPEG XL
Quality, resize, and palette controls
All processing runs locally in the browser
Drag-and-drop with instant feedback
Pros
- Completely free and open source
- Images never leave your device
- Clear visual quality tradeoffs
Cons
- One image at a time in the UI
- No batch or folder workflows
- Requires a modern browser
📝 About Squoosh
Squoosh is Google Chrome Labs’ answer to image optimization: a free, open-source web app that squeezes images smaller while showing you exactly what you lose. Its split view compares the original against the compressed result side by side, so you can dial in quality with your own eyes rather than trusting a number.
The codec selection is the draw. MozJPEG, OptiPNG, WebP, AVIF, and JPEG XL are all available, alongside resizing, palette reduction, and quality sliders. Everything runs locally via WebAssembly, so images never leave your device, which matters for client work.
It handles one image at a time and has no batch mode, which limits it for production pipelines. But for a designer or developer fine-tuning a hero image, Squoosh remains the fastest, most transparent way to shrink files in 2026.
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