You could give FLIF [1] a try. With the help of Poly-FLIF [2] you can render it in the browser. Don't forget to try the lossy mode, it gives better compression

You could give FLIF [1] a try. With the help of Poly-FLIF [2] you can render it in the browser. Don't forget to try the lossy mode, it gives better compression with negligible loss in quality. 1: http://flif.info http://flif.info 2: https://github.com/UprootLabs/poly-flif/ https://github.com/UprootLabs/poly-flif/