base n

base N character sets

base n

base N character sets

base N

We need character sets!

tldr: use base20 for no confusion and no accidental words

base64

dense

1ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/

base64 url

change +/ to -_ to prevent url escaping

1ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_

base62

base64 without the special chars

1ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789

base58

base64 without special chars, skips some confusing characters

• 0 / O -> ``
• 1 / I / l -> 1

1123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz

base32

case insensitive, skips some confusing chars

• 0 / O -> ``
• 1 / I / l -> 1

1ABCDEFGHIJKLMNOPQRSTUVWXYZ234567

base32 Crockford

case insensitive, skips some confusing chars

• 0 / O -> 0
• 1 / I / l -> 1
• U / V -> V

10123456789ABCDEFGHJKMNPQRSTVWXYZ

base32H

case insensitive, skips some confusing chars

• 0 / O -> 0
• 1 / I -> 1
• 5 / S -> 5
• U / V -> V

10123456789ABCDEFGHJKLMNPQRTVWXYZ

base20 Open Location Code

case insensitive, no confusion, won't form words

123456789CFGHJMPQRVWX

base16 Hexadecimal

used more often as extended number/digit set

10123456789abcdef