Base-122 – A space efficient alternative to base-64
The use of codepoints below 32 (space, start of what's usually considered "printable") makes me a bit hesitant. A lot of systems won't preserve those characters. Base85 is a more efficient alternative to base64, and doesn't use that lower range:<p><a href="https://en.wikipedia.org/wiki/Ascii85" rel="nofollow">https://en.wikipedia.org/wiki/Ascii85</a>