ROT13 Encoder and Decoder
Rotate every letter by 13 to lightly obscure text. Applying ROT13 a second time gives you the original back, so one box does both jobs.
One operation that undoes itself
ROT13 is a Caesar cipher with a shift of exactly 13. Because the alphabet has 26 letters, rotating forward by 13 and then doing it again rotates a full 26 and lands you back where you started, so the same button both scrambles and unscrambles. It is the classic way to hide a spoiler or a punchline in plain sight without really encrypting anything. Only A to Z and a to z move; digits, spaces, and symbols pass through untouched, and it all runs right here in your browser.
When you want it hidden for real
ROT13 is reversible by anyone, so treat it as a toy, not a lock. When you need text that only you can read, Relic keeps an end-to-end encrypted memory of everything you copy, searchable across all your devices and kept for as long as you like. The toy is free, and the genuinely private memory is the upgrade.