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
248 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
Made by Vincent Bidaux using Webflow.
For more, follow inb4.webflow.io, @vin & @vinchubang on Twitter.