Base62

The base62 encoding scheme uses 62 characters. The characters consist of the capital letters A-Z, the lower case letters a-z and the numbers 0–9. It is a binary-to-text encoding schemes that represent binary data in an ASCII string format.[1][2]

 123456789ABCDEFGH JKLMN PQRSTUVWXYZabcdefghijk mnopqrstuvwxyz
= 58 characters = base58

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
= 62 characters = base62

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/
= 64 characters = base64

In some fonts the 0 (zero), I (capital i), O (capital o) and l (lower case L) characters look the same. The 0OIl characters are not used in the base58 encoding scheme.

Base62 table

The Base62 index table:

Index	Binary	Char		Index	Binary	Char		Index	Binary	Char		Index	Binary	Char
0	000000	A		16	010000	Q		32	100000	g		48	110000	w
1	000001	B		17	010001	R		33	100001	h		49	110001	x
2	000010	C		18	010010	S		34	100010	i		50	110010	y
3	000011	D		19	010011	T		35	100011	j		51	110011	z
4	000100	E		20	010100	U		36	100100	k		52	110100	0
5	000101	F		21	010101	V		37	100101	l		53	110101	1
6	000110	G		22	010110	W		38	100110	m		54	110110	2
7	000111	H		23	010111	X		39	100111	n		55	110111	3
8	001000	I		24	011000	Y		40	101000	o		56	111000	4
9	001001	J		25	011001	Z		41	101001	p		57	111001	5
10	001010	K		26	011010	a		42	101010	q		58	111010	6
11	001011	L		27	011011	b		43	101011	r		59	111011	7
12	001100	M		28	011100	c		44	101100	s		60	111100	8
13	001101	N		29	011101	d		45	101101	t		61	111101	9
14	001110	O		30	011110	e		46	101110	u
15	001111	P		31	011111	f		47	101111	v

See also

• List of numeral systems

References

1. "A secure, lossless, and compressed Base62 encoding". Institute of Electrical and Electronics Engineers. November 19, 2008. Retrieved 12 August 2020. This base62 compressed encoding has been tested & The 62 alphanumeric characters (A-Z, a-z, 0–9)
2. "A base62 transformation format of ISO 10646 for multilingual identifiers". Wiley-Blackwell. June 18, 2001. Retrieved August 13, 2020. within a [0–9][A–Z][a–z] range, a total of 62 base characters