Base62 Explained

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 scheme that represents binary data in an ASCII string format.^{[1] [2]}

123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz = 58 characters = base58 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz = 62 characters = base62 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/ = 64 characters = base64

Base62 table

The Base62 index table

Decimal	Binary	Base62		Decimal	Binary	Base62		Decimal	Binary	Base62		Decimal	Binary	Base62
0	000000	0		16	010000	G		32	100000	W		48	110000	m
1	000001	1		17	010001	H		33	100001	X		49	110001	n
2	000010	2		18	010010	I		34	100010	Y		50	110010	o
3	000011	3		19	010011	J		35	100011	Z		51	110011	p
4	000100	4		20	010100	K		36	100100	a		52	110100	q
5	000101	5		21	010101	L		37	100101	b		53	110101	r
6	000110	6		22	010110	M		38	100110	c		54	110110	s
7	000111	7		23	010111	N		39	100111	d		55	110111	t
8	001000	8		24	011000	O		40	101000	e		56	111000	u
9	001001	9		25	011001	P		41	101001	f		57	111001	v
10	001010	A		26	011010	Q		42	101010	g		58	111010	w
11	001011	B		27	011011	R		43	101011	h		59	111011	x
12	001100	C		28	011100	S		44	101100	i		60	111100	y
13	001101	D		29	011101	T		45	101101	j		61	111101	z
14	001110	E		30	011110	U		46	101110	k
15	001111	F		31	011111	V		47	101111	l

See also

• List of numeral systems

References

1. Book: 2008 11th IEEE Singapore International Conference on Communication Systems. . November 19, 2008 . 10.1109/ICCS.2008.4737287 . 12 August 2020 . "This base62 compressed encoding has been tested & The 62 alphanumeric characters (A-Z, a-z, 0–9)". Kejing He . Xiancheng Xu . Qiang Yue . A secure, lossless, and compressed Base62 encoding . 761–765 . 978-1-4244-2423-8 . 10831128 .
2. A base62 transformation format of ISO 10646 for multilingual identifiers . Software: Practice and Experience. June 18, 2001 . 10.1002/spe.408 . August 13, 2020 . "within a [0–9][A–Z][a–z] range, a total of 62 base characters". Wu . Pei-Chi . 31 . 12 . 1125–1130 . 32472727 .