~/tools/rot13
ROT13 / Caesar converter
Rotate letters by a fixed shift — ROT13 by default. Converts live as you type, entirely in your browser.
note: ROT13 is its own inverse — applying it twice returns the original text. For any other shift n, decoding means shifting by 26 − n (the Reverse button does the math for you).
note: Caesar rotation is obfuscation, not encryption. It shows up constantly in CTFs and old-school forums, never in real security controls.