Cipher Decoder
Decode Caesar-shifted text by adjusting the alphabet key.
Plain text
How to decode a shift cipher
Example
Dwwdfn dw gdzq! Converted instantly in your browser - Identify or test the number of positions used to shift the alphabet.
- Apply the same shift in the opposite direction to every letter.
- Review the output and adjust the key until the message becomes readable.
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Frequently asked questions
Which ciphers can this decoder handle?
The current decoder handles Caesar or ROT-style alphabet shifts.
Is my input uploaded?
No. EncodeLab performs this conversion locally in your browser. Your input is not sent to an EncodeLab server or stored by us.
What if I do not know the shift?
Try keys from 1 to 25 and look for readable output. A future version will display every possible shift at once.
Can this break modern encryption?
No. Caesar ciphers are simple historical transformations, not modern encryption.