Why Caesar Cipher
- Caesar (rotation) cipher with adjustable shift 0-25.
- ROT13 (shift 13) is its own inverse, apply twice to decrypt.
- Non-letters pass through untouched.
Common questions
Is Caesar Cipher free to use?
Yes. Caesar Cipher is completely free. There is no sign up, no trial, and no usage cap.
Do I need an account to use Caesar Cipher?
No. You can start using Caesar Cipher straight away. We do not ask for an email address or a login.
Is my data uploaded to a server when I use Caesar Cipher?
No. Caesar Cipher runs entirely inside your browser, so the text you enter never leaves your device and nothing is sent to us.
Do you store the text I use with Caesar Cipher?
No. Because everything happens locally in your browser, there is nothing for us to store. Close the tab and it is gone.
Is there a character or word limit in Caesar Cipher?
There is no fixed limit. Because Caesar Cipher runs in your browser, only very large amounts of text may slow things down.
Does Caesar Cipher keep my text private?
Yes. Your text is processed locally in the browser and is not sent to a server.
How do I use Caesar Cipher?
Enter or paste your text and Caesar Cipher updates the result as you go. When it looks right, copy or download it with one click.
Does Caesar Cipher work on phones and tablets?
Yes. Caesar Cipher is responsive and works in any modern browser on mobile, tablet, and desktop.
Which browsers does Caesar Cipher support?
It works in current versions of Chrome, Firefox, Safari, and Edge. For the best experience, keep your browser up to date.
Is there a limit on how often I can use Caesar Cipher?
No. You can use Caesar Cipher as many times as you need, at no cost.
Can I use Caesar Cipher for commercial or client work?
Yes. You are free to use the output in personal, educational, and commercial projects.
Why is Caesar Cipher free?
The site is supported by advertising, which lets us keep every tool free and open to everyone.
What should I do if Caesar Cipher gives an unexpected result?
First check that your text is formatted as expected. If something still looks wrong, use the feedback link on the page and we will take a look.