ROT13 Encoder / Decoder
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About ROT13 Encoder/Decoder
ROT13 rotates Latin letters by 13 positions—a self-inverse cipher where applying it twice returns the original text. It is folklore for hiding puzzle answers and forum spoilers.
How to Use ROT13 Encoder/Decoder
Paste plain or ROT13 text. Copy output—encode and decode use the same operation. Share puzzle hints without glaring spoilers in the feed.
When to Use ROT13 Encoder/Decoder
Puzzles: Hide answers in plain sight. Teaching: Introduce substitution ciphers before modern crypto. Memes: Nudge readers to decode a line.
Why Use This ROT13 Encoder/Decoder?
One click beats paper cipher wheels for quick online posts.
Unicode vs HTML formatting
Real security needs modern cryptography. ROT13 is a toy transform, not protection for secrets.
Platform compatibility
Forum spoilers, geocaching hints, and classroom demos. Anyone who knows ROT13 can decode instantly.
How to use
1. Paste plain or ROT13 text.
2. Copy output—encode and decode use the same operation.
3. Share puzzle hints without glaring spoilers in the feed.
Frequently asked questions
Is ROT13 secure?
No. It is obfuscation for fun, not confidentiality.
Does ROT13 change numbers?
Typically only A–Z/a–z rotate; digits and punctuation stay put.