Caesar cipher

Shift letters by a fixed number to encode or decode — including ROT13, Atbash, ROT47, and a try-every-shift decrypter.

Cipher
Direction

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Only ASCII letters move under Caesar and Atbash; ROT47 also moves digits and punctuation. "Try all shifts" decodes the first 200 characters against every shift. Up to 100,000 characters.

How to use

  1. Paste the text.
  2. Choose a cipher and, for Caesar, a shift and direction.
  3. Convert — or use “try all shifts” to spot readable plaintext.

What it supports

Caesar and Atbash move ASCII letters only and keep case and all other characters; ROT47 shifts all printable ASCII including digits. “Try all shifts” decodes the first 200 characters at every shift. These are toy ciphers — they offer no real secrecy.

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