Free ROT13 Encoder / Decoder

New

Encode and decode text using ROT13, ROT47, and other Caesar ciphers.

Input (Plain Text)

0 characters

Output (ROT13)

0 characters

ROT13 Alphabet Mapping
A
N
B
O
C
P
D
Q
E
R
F
S
G
T
H
U
I
V
J
W
K
X
L
Y
M
Z
N
A
O
B
P
C
Q
D
R
E
S
F
T
G
U
H
V
I
W
J
X
K
Y
L
Z
M

Each letter maps to the letter 13 positions ahead. A↔N, B↔O, C↔P, etc.

About ROT13 and Caesar Ciphers

ROT13 is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. It's a special case of the Caesar cipher named after Julius Caesar who used similar ciphers for military communication.

Common Uses

  • Hiding spoilers in forums and discussions
  • Obscuring puzzle answers or punchlines
  • Simple email address obfuscation
  • Educational introduction to cryptography

Frequently Asked Questions

Common questions about ROT13 Encoder.

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