Squoosh
Free open-source image compression tool from Google that lets you visually compare and adjust output quality
Core features are free to use.squoosh.app
Highlights
- Before/after comparison slider for instant visual preview
- Supports modern formats including WebP, AVIF and MozJPEG
- Processes all images locally in your browser for full privacy
- Open-source project with transparent, reproducible compression parameters
Typical use cases
- Tuning optimal formats and parameters for web hero images
- Handling internal screenshots that cannot be uploaded to third parties
- Manually fine-tuning parameters to maximize compression for single images
Who it suits
- Front-end engineers
- Users concerned about image privacy
- Developers pursuing maximum compression ratio
Things to check before you commit
- Local browser processing may consume large amounts of memory for oversized images
- Batch compression capabilities are weaker than dedicated professional tools
Pricing
Google open-source tool, 100% free, processes images entirely locally without uploads.