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.{{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 }}{{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 |url-access=subscription }}

123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz

= 58 characters = base58

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

= 62 characters = base62

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/

= 64 characters = base64