Best Free Image Compression Tools Compared (2026)
What we measure: size, sharpness, and EXIF handling—on real photos.
Table of contents
Every “lossless” claim on the web is suspicious. We exported the same 24 MP JPEG through six browser workflows and measured what actually moved.
Our scoring rubric
- Bytes saved vs original
- SSIM on faces and fine text
- Workflow friction (upload ceilings, queues)
Browser vs desktop
Desktop apps still win for RAW pipelines. Browser tools win for one-off social crops.
Results snapshot
- Hero banners tolerate more aggressive passes.
- UI screenshots hate chroma noise—stay conservative.
Comparison posts age fast; we refresh numbers quarterly.
If you are selling products online, jump to remove backgrounds next.
Written by ToolBox Editorial Team
We test free browser tools every week so you can ship files faster—without installs or paywalls.
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