Letters and representations / 10 tools
Text & Encoding
Explore letter shifts and translate ASCII text to and from hexadecimal.
Inductors & Tuned Circuits
Text transformations
ROT Explorer
Encode, decode, compare all shifts, and see every letter move through a live alphabet map.
Open tool →
Vigenère & Autokey Cipher
Encode and decode with a repeating Vigenère key or a self-extending Autokey stream, and watch the key stream build letter by letter.
Open tool →
Additive, Multiplicative & Affine Cipher
Encode and decode with a Caesar-style additive shift, a multiplicative cipher, or the combined affine cipher, with the modular-inverse math shown.
Open tool →
Rail Fence & Transposition Cipher
Encode and decode with a zigzag rail fence, a keyword-ordered row transposition, or a keyless columnar transposition, with the grid shown letter by letter.
Open tool →
Playfair Cipher
Build the 5x5 key square from a keyword, split text into digraphs, and encode or decode with the row, column, and rectangle rules shown.
Open tool →
Hill Cipher
Encode and decode with a 2x2 or 3x3 key matrix, multiplying letter blocks mod 26 and inverting the matrix to decode.
Open tool →
MD5 & SHA Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text, computed entirely in your browser.
Open tool →
AES Hex Calculator
Encrypt and decrypt hex data with a 128, 192, or 256-bit AES key in ECB mode, with every SubBytes, ShiftRows, MixColumns, and AddRoundKey step shown.
Open tool →