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|Uses the [[Arabic numerals]] 0–9 and the [[Latin alphabet|Latin letters]] A–Z (the [[ISO basic Latin alphabet]]). Commonly used by [[URL redirection]] systems like [[TinyURL]] or SnipURL/Snipr as compact alphanumeric identifiers.
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| [[Base45]] || Arbitrary || ~67% (97%{{efn|Encoding for QR code generation automatically selects the encoding to match the input character set, encoding 2 alphanumeric characters in 11 bits, and Base45 encodes 16 bits into 3 such characters. The efficiency is thus 32 bits of binary data encoded in 33 bits: 97%.}}) || [https://github.com/Dasio/base45/ Go] || Defined in IETF Specification RFC 9285 for including binary data compactly in a [[QR code]].<ref>{{Cite web|url=https://rfc-editor.org/rfc/rfc9285|title = The Base45 Data Encoding|date = 2022-08-11|last1 = Fältström|first1 = Patrik|last2 = Ljunggren|first2 = Freik|last3 = Gulik|first3 = Dirk-Willem van|quote=Even in Byte mode, a typical QR code reader tries to interpret a byte sequence as text encoded in UTF-8 or ISO/IEC 8859-1. ... Such data has to be converted into an appropriate text before that text could be encoded as a QR code. ... Base45 ... offers a more compact QR code encoding.}}</ref>
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| [[Base56]] || Integer || — || [http://rossduggan.ie/blog/codetry/base-56-integer-encoding-in-php/index.html PHP], [https://github.com/jyn514/base56 Python], [https://pkg.go.dev/toolman.org/encoding/base56 Go] || A variant of Base58 encoding which further sheds the lowercase 'i' and 'o' characters in order to minimise the risk of fraud and human-error.<ref>{{cite web |last=Duggan |first=Ross |date=August 18, 2009 |title=Base-56 Integer Encoding in PHP |url=http://rossduggan.ie/blog/codetry/base-56-integer-encoding-in-php/index.html}}</ref>
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| {{anchor|Base58}}Base58 || Integer || data-sort-value="73%"|~73% || [https://github.com/bitcoin/bitcoin/blob/master/src/base58.h C++], [https://pypi.python.org/pypi/base58 Python], [https://github.com/medo64/Medo/blob/main/src/Medo/Convert/Base58.cs C#], [https://github.com/NovaCrypto/Base58 Java] || Similar to Base64, but modified to avoid both non-alphanumeric characters (+ and /) and letters that might look ambiguous when printed (0{{snd}} zero, I{{snd}} capital i, O{{snd}} capital o and l{{snd}} lower-case L). Base58 is used to represent [[bitcoin]] addresses.{{cn|date=April 2023}} Some messaging and social media systems [[Line wrap and word wrap|break lines]] on non-alphanumeric strings. This is avoided by not using [[Percent-encoding#Reserved characters|URI reserved characters]] such as +. For [[SegWit]], it was replaced by Bech32, see below.
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