for all of those who **cannot install optipng and other necessary tools** on their servers. - Options/API Key could sit in a yaml config file. - Tinypng's API reference: https://tinypng.com/developers/reference - KrakenIO's API https://kraken.io/docs/integration-upload Costs: - TinyPNG: 500 API requests / month are free for everyone - KrakenIO: MicroPlan is $5 / 500MB of images