Caesar Cipher

Encrypt or decrypt text with a configurable Caesar shift.

Free · Runs in your browser · Last updated 2026-05-03

Shift: 3

Plain text

Cipher text

About this tool

Classic Caesar cipher with adjustable shift (1–25). Preserves case and leaves non-letters untouched.

Privacy

All processing for Caesar Cipher happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the Caesar Cipher free to use?

Yes. Caesar Cipher is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use Caesar Cipher?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does Caesar Cipher work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

Caesar Cipher works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. Caesar Cipher runs in any modern web browser with no installation, browser extension, or account required.

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