View source for Base62

{{Short description|Positional notation using 0-9, A-Z, and a-z}}
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.<ref name="ieee">{{cite book |title=  2008 11th IEEE Singapore International Conference on Communication Systems|url=https://ieeexplore.ieee.org/document/4737287 |archive-url= |publisher=[[Institute of Electrical and Electronics Engineers]] |archive-date= |date=November 19, 2008 |doi=10.1109/ICCS.2008.4737287 |accessdate=12 August 2020 |quote="This base62 compressed encoding has been tested & The 62 alphanumeric characters (A-Z, a-z, 0–9)"|last1=Kejing He |last2=Xiancheng Xu |last3=Qiang Yue |chapter=A secure, lossless, and compressed Base62 encoding |pages=761–765 |isbn=978-1-4244-2423-8 |s2cid=10831128 }}</ref><ref name="wiley">{{cite journal |title=A base62 transformation format of ISO 10646 for multilingual identifiers |url=https://onlinelibrary.wiley.com/doi/pdf/10.1002/spe.408 |archive-url= |journal= Software: Practice and Experience|archive-date= |date=June 18, 2001 |doi=10.1002/spe.408 |accessdate=August 13, 2020 |quote="within a [0–9][A–Z][a–z] range, a total of 62 base characters"|last1=Wu |first1=Pei-Chi |volume=31 |issue=12 |pages=1125–1130 |s2cid=32472727 }}</ref>
123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz
= 58 characters = [[base58]]
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
= 62 characters = '''base62'''
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/
= 64 characters = [[base64]]
==Base62 table==
<span id="Base62table">The Base62 index table</span>:
{|class="wikitable" style="text-align:center"
|-
!scope="col"| Decimal !! scope="col" | Binary !!scope="col"| Base62
|rowspan="17"|
!scope="col"| Decimal !! scope="col" | Binary !!scope="col"| Base62
|rowspan="17"|
!scope="col"| Decimal !! scope="col" | Binary !!scope="col"| Base62
|rowspan="17"|
!scope="col"| Decimal !! scope="col" | Binary !!scope="col"| 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 ==
<references />
[[Category:Internet Standards]]
[[Category:Binary-to-text encoding formats]]
[[Category:Data serialization formats]]