Base62

Base62 is a binary-to-text encoding that represents arbitrary data as ASCII text. It encodes data as the 62 letters and digits of ASCII capital letters A-Z, lower case letters a-z and digits 0–9.
123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz
= 58 characters = base58
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
= 62 characters = base62
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/
= 64 characters = base64

Alphabet

The Base62 alphabet:

Value	Char		Value	Char		Value	Char		Value	Char
0			16			32			48
1			17			33			49
2			18			34			50
3			19			35			51
4			20			36			52
5			21			37			53
6			22			38			54
7			23			39			55
8			24			40			56
9			25			41			57
10			26			42			58
11			27			43			59
12			28			44			60
13			29			45			61
14			30			46
15			31			47