Caesar Cipher
Shift Latin letters by a chosen amount. ROT13 is shift 13.
How it works
Paste the input text
Type or paste the text. Numbers, spaces, and punctuation stay as they are.
Set the shift
Use the slider, the number 0–25, or a key letter. Encode shifts forward, decode shifts back. Output updates as you type. Shift 13 is ROT13.
Copy or list all shifts
Copy is on the input and output labels. All shifts shows every decode from 0 to 25.
What is a Caesar cipher?
A Caesar cipher moves each letter a fixed number of steps in the Latin alphabet. Julius Caesar is said to have used a shift of three: HELLO becomes KHOOR. ROT13 is the same idea with a shift of 13. This tool encodes, decodes, or lists all 26 shifts. It runs in the tab. Easy24 does not receive the text.
Why use this tool
- Caesar Cipher runs in a browser tab.
- Encode, decode, or list all 26 shifts
- Key letter A–Z sets the shift; N is ROT13
- No account. Unlimited on the free plan
- Numbers, spaces, and punctuation stay unchanged
Questions
What is a Caesar cipher?
A Caesar cipher shifts each Latin letter by a fixed number of places. HELLO with shift 3 becomes KHOOR. This page runs in your browser.
How do I use it?
Paste input text, set the shift, then pick encode or decode. The output updates as you type. Copy is on each field label.
What is ROT13?
ROT13 is a Caesar cipher with shift 13. Encoding twice returns the original text. Set the shift to 13, or use the key N.
What does All shifts do?
It lists every decode from shift 0 to 25. Use it when you do not know the key. There are 26 possible shifts.
What is the key field?
One A–Z letter, always in sync with the slider and the number. A is 0, B is 1, D is 3, N is 13. Other characters are ignored.
Are Turkish letters shifted?
No. Only A–Z and a–z move. Ç, ğ, ı, ö, ş, ü and digits stay as they are.
Is this real encryption?
No. A Caesar cipher is a classroom shift. 26 keys is not a secret. Do not use it for passwords or private data.
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When to use Caesar Cipher
If you only need Caesar Cipher once in a while, a browser page is often enough: set options, get a result, move on. Shift Latin letters by a chosen amount. Never paste production secrets into a shared computer you do not trust. Even local tools run in that machine’s memory. Search results often mix upload-based converters with local tools. Read the privacy note on this page so you know which model you are using. On Easy24, normal use of this tool keeps processing in your browser. That means the content you paste or the file you pick does not need to be uploaded to finish the job. This page has no daily free-plan cap, so you can run it as often as you need. For product-wide questions about accounts, ads, and Pro, see the site FAQ and Security pages. For this tool’s exact steps, use the guide blocks above.
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