Tool guide
ROT13 hides text from a casual glance rather than from an attacker: a film spoiler, a riddle answer, a punchline in a comment thread. Each Latin letter moves thirteen places forward and, since the alphabet has twenty-six letters, running it twice restores the original. That is why there is a single button here instead of an encrypt and decrypt pair. Everything runs in the page script, with no network calls. See also: a Caesar shift with any offset, keyword-based text encryption, flip a string backwards.
Thirteen is exactly half of the twenty-six letters in the Latin alphabet. Applying a thirteen-place shift twice returns each letter to where it started, so encoding and decoding are literally the same operation. Press CONVERT a second time and the original comes back.
Nothing. The rotation is defined for A to Z only, so Cyrillic passes through unchanged and cannot be hidden this way. Transliterate into Latin letters first, or use a different trick such as converting the phrase to binary.
No. ROT13 is not encryption in any meaningful sense: there is no key, there is only one possible variant, and anyone with any online tool reads it in a second. It is for hiding a spoiler or a puzzle answer from an accidental glance, not from a person who wants to read it.
The interface is deliberately minimal — an input area, an output area and the CONVERT button. Select the result with the mouse, or long-press on a phone, and copy it with the keyboard or the context menu. The neighbouring Caesar and Vigenere tools do have a copy button.
ROT13 only touches letters, while ROT47 rotates the whole printable ASCII range — digits and punctuation included — by forty-seven positions. The result looks far more scrambled, but it is still a keyless substitution. This page implements the classic ROT13.
No. The substitution runs in a short script inside the tab, nothing is sent to a server, and both fields are empty again after a reload. Even so, do not paste genuinely sensitive material here, simply because ROT13 offers it no protection at all.
Before: The butler did it
After: Gur ohgyre qvq vg
Before: Gur ohgyre qvq vg
After: The butler did it
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