External
Squoosh
The gold standard for compressing one image really well.
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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