External
Squoosh
The gold standard for compressing one image really well.
Official site: squoosh.app
Squoosh is an open source image compressor from the Chrome team that runs entirely in your browser. It offers modern codecs like WebP and AVIF with a live side-by-side quality slider, so you see exactly what each byte costs.
Best for: Use this when you want to hand-tune the compression of a single image with a visual before-and-after.
Pros
- Processes images locally in the browser, nothing is uploaded
- Side-by-side quality comparison with a draggable divider
- Supports modern codecs like WebP and AVIF
Cons
- One image at a time, there is no batch mode
- Compression only, no cropping or editing
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