Interactive cryptography tools

Shift plaintext letters by a fixed number of positions.

ROT13

Rotate letters by 13 positions with the same operation for encoding and decoding.

Rotation Try it

Atbash Cipher

Mirror the alphabet so A maps to Z, B to Y, and so on.

Affine Cipher

Encrypt text with E(x) = (ax + b) mod 26 using configurable keys and formatting options.

Mathematical Try it

Keyword Cipher

Build a keyed substitution alphabet from a cleaned keyword.

Substitution Cipher

Encrypt or decrypt text with a fully custom monoalphabetic substitution alphabet.

Pigpen Cipher

Symbol substitution Try it

Turn letters into the geometric grid-and-X symbols of the Pigpen cipher, or decode a message with the clickable visual alphabet.

Polyalphabetic

5 tools

Vigenère Cipher

Polyalphabetic substitution cipher using a repeating key.

Polyalphabetic Try it

Beaufort Cipher

Use a repeating keyword with the reciprocal Beaufort rule C = K - P mod 26.

Polyalphabetic Try it

Autokey Cipher

Extend a keyword with plaintext letters for a stronger polyalphabetic stream.

Polyalphabetic Try it

One-Time Pad / Vernam Cipher

Encrypt or decrypt letters with an equal-length key, securely generate a random pad in your browser, and inspect every modulo-26 step.

Perfect secrecy Try it

Enigma Machine Simulator

Advanced

Configure Enigma I, M3, or M4 rotors, ring settings, reflectors, and plugboard wiring with live output and signal tracing.

Rotor machine Try it

Transposition

2 tools

Rail Fence Cipher

Write text in zig-zag rails and read row-by-row.

Transposition Try it

Columnar Transposition Cipher

Write letters into keyword columns and read them back in alphabetical key order.

Transposition Try it

Polygraphic

2 tools

Playfair Cipher

Encrypt letter pairs with a 5×5 keyword square and digraph rules.

Digraph Try it

Hill Cipher

Advanced

Encrypt letter blocks with square key matrices and modular arithmetic.

Matrix Try it

Polybius Family

6 tools

Polybius Square Cipher

Encode letters as row-and-column coordinates using the classic 5x5 Polybius square.

Coordinates Try it

Tap Code Cipher

Send letters as row-and-column tap groups using the classic 5x5 tap code square.

Tap groups Try it

Bifid Cipher

Mix Polybius square coordinates in fixed-size blocks to create a fractionating classical cipher.

Fractionation Try it

Nihilist Cipher

Encrypt or decrypt numeric Nihilist ciphertext with a keyed Polybius square and repeated additive key.

Numeric additive Try it

ADFGX Cipher

Use a keyed ADFGX square followed by keyed columnar transposition.

Fractionation Try it

ADFGVX Cipher

Use a keyed ADFGVX square with letters and digits, then apply keyed columnar transposition.

Fractionation Try it

Encodings

11 tools

File & Message Encryptor

Authenticated encryption Try it

Encrypt individual files or private messages locally in your browser with password-based authenticated encryption.

Base64 Encoder / Decoder

Encode text into Base64 or decode Base64 back into readable UTF-8 text.

Base32 Encoder / Decoder

Encode text into RFC 4648 Base32 or decode Base32 back into readable UTF-8 text.

URL Encoder / Decoder

Encode text into URL-safe percent encoding, or decode percent-encoded strings back into readable text.

Percent encoding Try it

Ascii85 / Base85 Encoder / Decoder

Encode bytes into Ascii85/Base85 text, or decode Base85 variants back into readable UTF-8 or hex bytes.

XOR Cipher

Encrypt or decrypt bytes with a repeating XOR key, using text, hex, or Base64 input and output.

Byte cipher Try it

Unicode / UTF-8 Inspector

Inspect grapheme clusters, Unicode code points, UTF-16 code units, and UTF-8 bytes, or decode raw bytes back into text.

Unicode Try it

Hex Encoder / Decoder

Encode readable text into hexadecimal byte values or decode hex back into readable UTF-8 text.

A1Z26 Cipher

Convert letters to numbers and back again using A = 1 through Z = 26.

Letter-number Try it

A1Z26 Puzzle Generator

Create graded A1Z26 number puzzles, solve letter-number messages, and test yourself with timed challenges.

Puzzle practice Try it

Morse Code Translator

Translate text to Morse and Morse back to text with audio playback and live signal highlighting.

Signal encoding Try it

Baconian

2 tools

Simple Bacon's Cipher

Encode letters as five-character A/B groups using the classical 24-letter Bacon alphabet.

Encoding Try it

Advanced Bacon's Cipher

Advanced

Use direct Bacon symbols, custom A/B pairs, 24/26-letter alphabets, and hidden case-based steganography.

Steganography Try it

Analysis

1 tool

Frequency Analysis

Paste ciphertext to inspect letter frequencies, repeated patterns, common bigrams and trigrams, word shapes, index of coincidence, and a best-guess decoded output.

Analysis Try it

Other Tools

4 tools

Base58 / Base58Check Encoder / Decoder

Encode text or hex bytes into Base58, decode Base58 strings, and inspect Base58Check version bytes and checksums.

Bech32 / Bech32m Encoder / Decoder

Encode bytes into Bech32 or Bech32m, decode checksummed strings, and inspect prefixes, data words, checksums, and Bitcoin witness structure.

Binary Translator

Translate readable text into binary bytes, or decode binary back into UTF-8 or ASCII text.

Hash Generator

Generate SHA-256, SHA-384, SHA-512, SHA-1, and MD5 hashes from text or files directly in your browser.