Ciphers and Codes100% Free14 tools

Free Cipher and Code Tools for Puzzles and Learning

Encrypt, decrypt and crack classic ciphers, spell with the NATO alphabet, write Braille, or play with leetspeak and Pig Latin. Every tool runs in your browser, so your text stays private.

Substitution ciphers

Caesar Cipher Encoder and DecoderEncrypt, decrypt or brute force a Caesar cipher. Atbash CipherMirror the alphabet to encode or decode text. Vigenère CipherEncrypt or decrypt text with a repeating keyword. Affine CipherEncrypt or decrypt with the affine formula (ax + b) mod 26. A1Z26 CipherConvert letters to alphabet numbers and numbers to letters. Bacon CipherEncode letters as five-symbol A and B groups and decode them. Polybius Square CipherEncode letters as row and column numbers in a Polybius grid. Playfair CipherEncrypt or decrypt with a Playfair key square.

Transposition ciphers

Rail Fence CipherEncrypt or decrypt with a zigzag rail fence pattern.

Modern basics

XOR CipherXOR text with a key and read the hex result, or decrypt it.

Alphabets and codes

NATO Phonetic Alphabet ConverterSpell text with the NATO alphabet or decode NATO words. Braille TranslatorConvert text to Unicode Braille (grade 1) and back.

Text styles

Leetspeak ConverterConvert text to leetspeak (1337) and decode simple leet. Pig Latin TranslatorTranslate English to Pig Latin and decode it.

How These Cipher Tools Work

Every tool on this site runs in your browser with JavaScript. The text you enter is processed on your own device. It is not uploaded, stored or logged, and no outside service is used.

These are classic ciphers and codes for learning, puzzles, escape rooms and geocaching. They are not secure. For real secrets, use modern, well-tested encryption.

Which Tool Should I Use?

Shift and substitution: Caesar, Atbash, affine, Vigenère and Playfair.
Transposition and grids: the rail fence cipher and the Polybius square.
Number and binary codes: A1Z26, the Bacon cipher and the XOR cipher.
Alphabets and fun: the NATO alphabet, Braille, leetspeak and Pig Latin.

More free tools: text tools, developer tools and math calculators. To learn how ciphers developed, see the Wikipedia article on classical ciphers.