[sondh]

These guys (https://evilmartians.com/) sure understands a thing or two about images and image compression. I have used their imgproxy[1] (Golang image resizer) for a long time and it has been solid from the very beginning.

[1] https://github.com/imgproxy/imgproxy

[manigandham]

I recommend Thumbor if you want the advanced manipulation and smart cropping features common in the hosted services: https://github.com/thumbor/thumbor