Caesar Cipher
Encode and decode the Caesar cipher with any shift, or try all 25 shifts and see the most likely one. Keeps case and punctuation. Free and private.
More options
This is not secure encryption: anyone can break it. Use AES encryption for real secrets.
Shortcuts: Ctrl+Enter run · Ctrl+Shift+C copy result · / search (use ⌘ on Mac)
Next steps
Done here? Use the Send to… menu on the result to carry it on to Vigenère Cipher or ROT13 / ROT47.
Free Caesar Cipher
Move every letter along the alphabet by a fixed number. Type your text and the shift to encode, or use Decode with the same shift. A table of all shifts helps when the shift is not known. It gives developers a quick browser-based way to solve a focused caesar cipher task before moving the result into a project.
How to use Caesar Cipher
Choose Encode or Decode and set the shift. The table below tries every shift on your text and marks the most English-looking one.
Common mistakes
- Using it to protect real information: use AES instead.
- Decoding with the wrong direction: Decode with the same shift reverses Encode.