Letters to Numbers Logo
Workspace

Note: Autosolver supports fewer languages.

Manual mode: Enter text and fill the mapping one by one or string.

Letter translations

This is a monoalphabetic string. The string and the grid below stay in sync. Unassigned letters are shown in grey.

ABCDEFGHIJKLMNOPQRSTUVWXYZ
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Letters to Numbers Logo

Letters to Numbers

Trusted Conversion Tools

Monoalphabetic Substitution Cipher

Encrypt and decrypt using monoalphabetic ciphers

Who Is It For?

Cryptography Students

Understanding basic substitution ciphers

Secret Message Creators

Simple encryption for private communications

Game Designers

Adding cipher elements to puzzles

How It Works

Create a custom alphabet mapping or use a predefined key. Encrypt messages by substituting each letter according to your mapping. Share the key with recipients for decryption.

Features

  • Create custom substitution keys
  • Random key generation
  • Encrypt/decrypt functionality
  • Key management and storage
  • Frequency analysis indicators
  • Educational cipher info

Other Tools

Explore more tools by clicking the + button above

Letters to Numbers Converter
Convert letters to numbers using A1Z26 cipher
A1Z26 Translator
Translate letters to numbers with the A1Z26 alphabet
A1Z26 Decoder and Encoder
Encode letters to A1Z26 numbers and decode numbers back to letters instantly
A0Z25 Cipher Translator
Convert text using A0Z25 cipher encoding
A0Z25 Decoder
Decode A0Z25 encoded numbers back to letters instantly

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