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Skip to contentEncrypt or decrypt text with a Caesar shift or ROT13.
Encrypt or decrypt text with a Caesar shift or ROT13.
Security and encoding tools belong in a local, auditable environment. Generate secrets and validate formats without sending material to a remote API.
Use this free Caesar Cipher / ROT13 whenever you need a reliable result without creating an account or installing software. It loads in one click and works on desktop and mobile browsers.
Tentaco runs this tool in your browser whenever possible. Text and structured input you paste are handled in the page session unless the tool explicitly fetches remote data. Close the tab or clear the page after use on shared computers. Features that call external APIs (such as URL fetchers) only send the data required for that request.
Encrypt or decrypt text with a Caesar shift or ROT13. Open the tool in your browser — no account or install required.
Yes — cryptographically secure.
No — processing runs locally in your browser. Your files and inputs do not leave your device unless the tool explicitly uses the network.