# Caesar Cipher Encoder

> Encrypt and decrypt text with a Caesar shift cipher, including ROT13.

To use a Caesar cipher, enter your text and a shift amount. Each letter moves that many places through the alphabet, wrapping from Z back to A. A shift of 13 gives ROT13, which is its own inverse — applying it twice returns the original text.

**URL:** https://convertto.tech/t/caesar-cipher
**Category:** Encoders & Decoders (https://convertto.tech/c/encoding-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your text.
2. Set the shift.
3. Choose the mode.
4. The result appears immediately — copy or download it.

## FAQ

### Is a Caesar cipher secure?

Not at all. With only 25 possible shifts it can be broken by hand in seconds. It is a teaching example and a puzzle device, not a way to protect real information.

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