[detaro]

No, because of padding rules. e.g. "ab" isn't valid base64, because it only encodes 12 bits, not a multiple of bytes. base64 is thus always with padding to a multiple of 3 input byte (equaling 3*8/6 = 4 output characters)

[IshKebab]

Right but they're still pretty confused, because the probability is 1/4, not "very low".