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Re:Show HN: Jpeg.io – Convert any major image format into a ... by TazeTSchnitzel on Thursday September 29, 2016 @07:02AM (#12604381)
Command-line-only apps are typical of this genre of software (pngquant, pngcrush, all the webp utilities, ffmpeg, etc.)

However, sometimes there are GUI apps which wrap the tool itself.

Re:Show HN: Jpeg.io – Convert any major image format into a ... by aluhut on Thursday September 29, 2016 @01:40PM (#12607197)
There has been a request pending for it on the IrfanView forums for 3 years now ;)