AVIF

[ausi]

AV1 Image File Format (AVIF).

A 307 byte version: AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUEAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAABkAAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAEAAAABAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgSAAAAAAABNjb2xybmNseAACAAIABoAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAACFtZGF0EgAKBzgADtAgIGkyDB/wYAALAAAAhPPLwA==

But there are probably way smaller sizes possible.

[TransparentLC]

298 bytes version:

data:image/avif;base64,AAAAHGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZgAAAPJtZXRhAAAAAAAAAChoZGxyAAAAAAAAAABwaWN0AAAAAAAAAAAAAAAAbGliYXZpZgAAAAAOcGl0bQAAAAAAAQAAAB5pbG9jAAAAAEQAAAEAAQAAAAEAAAEWAAAAFAAAAChpaW5mAAAAAAABAAAAGmluZmUCAAAAAAEAAGF2MDFDb2xvcgAAAABqaXBycAAAAEtpcGNvAAAAFGlzcGUAAAAAAAAAAQAAAAEAAAAQcGl4aQAAAAADCAgIAAAADGF2MUOBTQgAAAAAE2NvbHJuY2x4AAIAAgACgAAAABdpcG1hAAAAAAAAAAEAAQQBAoMEAAAAHG1kYXQSAAoFWAAOxIAyCRAAAAAP+I9ngg==