Ciphers Tools — 25 tools

Caesar Cipher

Shift letters by a fixed number of positions.

shift rot encrypt

ROT13

Rotate letters by 13 positions.

rotate encrypt decrypt

Vigenère Cipher

Polyalphabetic substitution using a keyword.

polyalphabetic key encrypt

Atbash Cipher

Reverse the alphabet (A↔Z, B↔Y…).

reverse alphabet encrypt

Morse Code

Encode/decode text to/from Morse code.

dots dashes telegraph

Binary Text

Convert text to/from binary (base-2).

01 bits base2

Hex Text

Convert text to/from hexadecimal.

hexadecimal base16

Base64

Encode/decode text in Base64.

encoding data

A1Z26 Cipher

Substitute each letter with its position (A=1…Z=26).

number alphabet position

Rail Fence Cipher

Transposition cipher writing in a zigzag pattern.

transposition zigzag

Playfair Cipher

Encrypt pairs of letters using a 5×5 key square.

digraph key 5x5

Beaufort Cipher

Reciprocal variant of the Vigenère cipher.

reciprocal key

Affine Cipher

Linear transformation encryption (ax+b mod 26).

linear modular encrypt

Polybius Square

Map letters to row/column coordinates.

grid coordinates 5x5

Tap Code

Grid-based knock/tap cipher used by prisoners.

prison knock

Pigpen Cipher

Geometric substitution cipher (masonic cipher).

freemason symbol geometric

Four-Square Cipher

Encrypts pairs using four 5×5 squares.

digraph key grid

Running Key Cipher

Vigenère variant using a long text as the key.

text-key book

Scytale Cipher

Ancient Greek transposition cipher using a rod.

transposition ancient rod

Columnar Transposition

Rearrange columns of text using a keyword.

columns key rearrange

Gronsfeld Cipher

Vigenère variant using a numeric key.

numeric-key vigenere

Porta Cipher

Reciprocal cipher by Giovanni Battista della Porta.

reciprocal key

Trithemius Cipher

Progressive shift cipher (keyless Vigenère).

progressive shift

Chappe Telegraph

Visual semaphore telegraphic code.

semaphore visual

Navajo Code Talker Numbers

WWII Navajo code talker numeric substitutions.

wwii native