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Result
Method
For each ASCII letter, the tool moves its alphabet position by the selected shift modulo 26. Decode applies the inverse shift. A shift of 13 is ROT13; it is included here rather than owned by a separate page.
Worked example
With shift 3, HELLO becomes KHOOR. Decoding KHOOR with shift 3 returns HELLO.
Limitations
This is a classical educational substitution cipher, not secure encryption. Only ASCII A–Z and a–z are shifted; all other characters pass through unchanged.
Privacy and text handling
Processing is deterministic and browser-local. ASCII letter rules are explicit. Unsupported Unicode text passes through unchanged where the selected method permits it.
Shift reference
Shift 0 leaves letters unchanged. Shift 1 maps A to B. Shift 25 maps A to Z. The calculation wraps at the end of the alphabet.
Related text utilities
Compare this focused transform with the Morse Code Translator and Reverse Text, or browse all Text Utilities.