Crockford base32 [0] is the best compromise, IMO. Reasonable length of 26 chars. Uses only alphanumeric characters and avoids issues with case sensitivity and

Crockford base32 [0] is the best compromise, IMO. Reasonable length of 26 chars. Uses only alphanumeric characters and avoids issues with case sensitivity and confusing characters (0 vs O, etc.). 0: https://www.crockford.com/base32.html https://www.crockford.com/base32.html