99.9%accurate
500+tools
500+units
Cipher Decoder
Encode and decode Caesar, ROT13, Atbash, Base64 and reverse ciphers โ with auto-detect
Choose a cipher
Input
Output
Your result appears here.
About these ciphers
Caesar shifts each letter by a fixed amount (Julius Caesar used 3). ROT13 is Caesar-13. Atbash mirrors AโZ, BโY, etc. Reverse flips the entire string. Base64 encodes any text or binary as a safe ASCII string.
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