๐ Caesar Cipher Cracker
The quick brown fox jumps over the lazy dog
Show all shifts (25 options)
Enter Caesar-cipher ciphertext with an unknown shift, and this tool automatically guesses the most likely shift using frequency analysis โ comparing each of the 25 possible decodings against standard English letter frequencies. All 25 results are also available to compare directly.
How to use
- Enter the ciphertext you want to crack.
- The top guess (whichever shift looks most like English by frequency analysis) is shown automatically.
- Open "Show All Shifts" to compare all 25 possible decodings side by side.
FAQ
How does frequency analysis work?
English text has predictable letter frequencies (e.g. 'e' and 't' are common), so this tool picks whichever of the 25 possible shifts produces a letter distribution closest to standard English as its top guess.
Does this work reliably on short text?
Shorter text has more statistical noise, so an incorrect shift can sometimes rank first. Longer text (a few dozen characters or more) gives more reliable results.
Does this work on non-English ciphertext?
No, frequency analysis here is based on English letter frequencies, so it only works on English (Latin-alphabet) text.