ROT47 Cipher

How it is calculated

ROT47 shifts every printable ASCII character with code 33 to 126 (94 characters: letters, digits and punctuation) forward by 47 places, wrapping around at the end: new = 33 + ((code − 33 + 47) mod 94). Spaces, line breaks and any character outside that range, such as accented letters or emoji, are copied through unchanged.

Since 47 is exactly half of 94, applying the cipher twice returns the original text, so the same operation both encodes and decodes. There is no key and no secrecy: it only hides text from a casual glance. The tool works byte by byte, so non-ASCII characters are left as they are.

Common mistakes

• Treating ROT47 as encryption. Anyone can reverse it in seconds with no key, so never use it for passwords or private data.
• Expecting it to work like ROT13. ROT13 only moves letters and leaves digits and punctuation, so ROT13 text and ROT47 text do not decode each other.
• Expecting accented letters (ç, ö, ğ) or emoji to be scrambled. Only the 94 printable ASCII characters change.
• Trying to decode a message that was changed by an email client or editor, for example with curly quotes replacing straight ones. Any changed character breaks the result.