Came here to post this... yEnc is about as compact as you can get, and has been around for over a decade. Besides that, the Z85 encoding is the next runner up

Came here to post this... yEnc is about as compact as you can get, and has been around for over a decade. Besides that, the Z85 encoding is the next runner up as a compact "string safe" encoding: https://rfc.zeromq.org/spec:32/Z85/ https://rfc.zeromq.org/spec:32/Z85/