Caesar Cipher Decoder

About

Caesar Cipher Decoder gives you instant, offline brute-force decoding of Caesar-shifted text,
  right from your browser's context menu.

  HOW IT WORKS
  • Select any ciphertext on any web page.
  • Right-click → "Decode as Caesar Cipher".
  • A new tab opens showing all 26 shift candidates (0 = original, 1-25 = decoded).
  • Click any row to copy the plaintext.

  PRIVACY
  • 100% offline. No network calls, no telemetry, no tracking, no data collection.
  • Only one Chrome permission: contextMenus. The extension cannot read page contents, only the
  text you explicitly select and pass via the right-click menu.
  • Open source — see the GitHub repository linked below.

  DESIGNED FOR
  • CTF players solving classical-cipher challenges
  • Cryptography students
  • Puzzle enthusiasts
  • Security researchers eyeballing encoded strings

  NEED MORE CIPHER TOOLS?
  This extension is deliberately single-purpose. For Vigenère, Atbash, Autokey, Rail Fence,
  Playfair, and 20+ other classical ciphers, plus encoding and step-by-step walkthroughs, visit
  the companion site at caesarcipher.org.