Shift letters with an adjustable Caesar cipher. Slider from 0 to 25 — includes ROT13 at shift 13.
Shift each letter by the selected amount. To decode, use shift 23 (or rotate the slider).
More free utilities you might find useful
Quick answers to common questions
Each letter shifts forward in the alphabet by a fixed number. Shift 3 turns A into D and Z into C.
Apply the reverse shift. If you encoded with shift 3, decode with shift 23 (or 26 minus your shift).
ROT13 is a Caesar cipher with shift 13. Because 26 ÷ 2 = 13, applying it twice returns the original text.
No. Only A–Z and a–z are shifted. Everything else stays the same.
No. Caesar cipher is a classic puzzle cipher — trivial to break. Do not use for secrets.
Yes. Use the Copy output button.
Yes. No server processing.
Yes.
Your data is processed entirely in your browser. Nothing is sent to any server.