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

123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz
= 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, and thus are not used in the base58 encoding scheme.

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

References

↑ Kejing He; Xiancheng Xu; Qiang Yue (November 19, 2008). "A secure, lossless, and compressed Base62 encoding". 2008 11th IEEE Singapore International Conference on Communication Systems. Institute of Electrical and Electronics Engineers. pp. 761–765. doi:10.1109/ICCS.2008.4737287. ISBN 978-1-4244-2423-8. S2CID 10831128. Retrieved 12 August 2020. This base62 compressed encoding has been tested & The 62 alphanumeric characters (A-Z, a-z, 0–9)
↑ Wu, Pei‐Chi (June 18, 2001). "A base62 transformation format of ISO 10646 for multilingual identifiers". Software: Practice and Experience. 31 (12): 1125–1130. doi:10.1002/spe.408. S2CID 32472727. Retrieved August 13, 2020. within a [0–9][A–Z][a–z] range, a total of 62 base characters

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[ieee-1] Kejing He; Xiancheng Xu; Qiang Yue (November 19, 2008). "A secure, lossless, and compressed Base62 encoding". 2008 11th IEEE Singapore International Conference on Communication Systems. Institute of Electrical and Electronics Engineers. pp. 761–765. doi:10.1109/ICCS.2008.4737287. ISBN 978-1-4244-2423-8. S2CID 10831128. Retrieved 12 August 2020. This base62 compressed encoding has been tested & The 62 alphanumeric characters (A-Z, a-z, 0–9)

[wiley-2] Wu, Pei‐Chi (June 18, 2001). "A base62 transformation format of ISO 10646 for multilingual identifiers". Software: Practice and Experience. 31 (12): 1125–1130. doi:10.1002/spe.408. S2CID 32472727. Retrieved August 13, 2020. within a [0–9][A–Z][a–z] range, a total of 62 base characters

[1]

[2]

Base62 table

See also

References