Letter Numbers
One of the first ciphers that kids learn is this "letter number" cipher. You replace letters with a number: A=1, B=2, C=3, etc.
When encrypting, only letters will be encoded and everything else will be left as-is. Encoded numbers can be separated by a delimiter. Numbers can also be padded with zeros so "A" is changed into "01".
Operating mode:
Alphabet:
Alphabet key:
Resulting alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZ
The text to encode or decode:
Remove: letters, numbers, whitespace, other things
Change: lowercase, Natural case, Title Case, UPPERCASE, swap case, reverse
Make groups of and next line after groups
Delimiter between encoded letters: