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SVGIZE

A command line tool to make transparent JPEG images with the help of SVG. Use it to dramatically reduce filesize of transparent PNG images.
By Vlad Danilov — Visit the project page on Git
PNG24 image with 8 bit alpha channel
264 Kb
JPG + PNG8 for alpha channel, inside of a SVG
64 Kb
Download SVGIZE on Git

Automator Workflow for SVGIZE

Easily use SVGIZE on right click in macOS Finder with this Automator Workflow.
Download the Automator Workflow file