Caesar Cipher
The Caesar cipher shifts every letter by a fixed number of positions in the alphabet. Pick a positive shift to encrypt and the negative of that shift to decrypt. Case is preserved and non-letter characters pass through unchanged. Runs entirely in your browser.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Cipher
Related tools
Tools that work with the same formats — most users open one of these next.
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Frequently asked
Is Caesar Cipher free to use?
Yes. Caesar Cipher is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — Caesar Cipher runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does Caesar Cipher work?
Open Caesar Cipher, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does Caesar Cipher support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. Caesar Cipher uses standard web APIs and does not require any plugin, extension, or sign-up.