Stuck with a cipher or secret code? This free AI tool will help you identify the type of encryption and guide you how to decode and solve it.

Free Caesar cipher decoder supporting 25+ languages. Learn the history, master the math, and try the examples.

Free Vigenère cipher tool to encode and decode messages instantly. Learn how the cipher works, explore cryptanalysis tips, and try a practice puzzle.

Free online Atbash cipher tool to encode and decode messages instantly, with support for 25+ languages. Discover how this ancient substitution cipher, based on simple alphabet reversal, …

Decode or encode messages with this free online A1Z26 cipher translator. Instantly convert text to numbers and numbers to letters, and discover how this simple substitution cipher — where A=1, …

Tool to decrypt Playfair ciphers. The Playfair cipher was invented in 1854 by Charles Wheatstone, but named after lord Playfair who heavily promoted the use of the cipher. It is a polygraphic substitution …

Tool to translate pigpen cipher. Pigpen cipher is a monoalphabetic substitution cipher, where the letters are replaced by geometric symbols. It is also known as masonic cipher, Freemason's ciper, …

Free substitution cipher tool with a live letter-translation grid, shareable keyPattern string, and letter-frequency bars. Map every ciphertext letter to any plaintext letter and switch to the autosolver when …

Tool to decode rail fence ciphers. The rail fence cipher is a simple transposition cipher. It is also known as a zigzag cipher. In a rail fence cipher, the plaintext letters are written diagonally in a up-down …

Tool to decode columnar transposition ciphers. In a columnar transposition cipher, the message is written in a grid of equal length rows, and then read out column by column. The columns are chosen …