Halloween at the Portal. The Hollow, a haunted cipher maze, is free to play until 2 November. Enter The Hollow

Build your own decoding pipeline

Paste a message, then stack tools on it: Base64 → XOR → Caesar, or Morse → Vigenère. Every step shows its result instantly, and the lens runs frequency analysis, index of coincidence or Kasiski on any stage so you know what to try next.

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Just need one tool? All cipher tools stay free, no account needed.

How the workshop works

Transformers (ciphers and encodings) turn text into text, so they chain: the output of each step is the input of the next. Analyzers don't change the text. Point the lens at any stage to read its statistics — a high index of coincidence after a step usually means you're one substitution away from plaintext.

Every tool here is the same code as its full page in the tools section, so results always match.