I'll soon be open-sourcing a native cross-platform image & video compression app for both iOS & Android. For PC, I may rewrite it in Rust.

On medium settings, it reduces file size by 60%-70%, I can bring it to 90%. 
Its performance already surpasses any web-based alternative by a significant margin.

Very early stage demo, already keeps history:
https://w3.do/uh5PKbOz
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