Caesar Cipher

Encrypt or decrypt text with a Caesar shift cipher — any shift, including the classic ROT13. Runs in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is Caesar Cipher free to use?

Yes — Caesar Cipher is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. Caesar Cipher works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use Caesar Cipher?

Open the tool, add your file (or paste your content), adjust any options, then press “Apply cipher”. Your result is ready to download in seconds.

Keyword-based classic cipher.

Characters ↔ their code points.

Smart Title Case, sentence case & more.

Pick winners fairly from a list.

Vectorise Enhanced Metafiles.

Crop a photo to Instagram, YouTube and other sizes.