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ROT13 Encoder / Decoder

Encode or decode text with ROT13, ROT47, or a custom Caesar shift. ROT13 and ROT47 are self-inverse — apply the same operation again to decode.

Shift letters by 13 (self-inverse)

Output
17
Input length
17
Output length
Round-trip check (apply same op to output → should match input)
Hello, World! 123

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