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Encoding
Caesar Cipher / ROT13
Encode or decode text with the classic Caesar shift cipher. Adjust the shift from 0 to 25 with a slider, jump to ROT13, or scan a clickable brute-force list of all 26 shifts to crack a hidden message.
- Published
- Last reviewed
Tool Summary Answer Block
This tool accepts structured input and returns deterministic output in the browser with no server upload.
- Tool name
- Caesar Cipher / ROT13
- Input intent
- Provide source content to transform, validate, or analyze.
- Output intent
- Receive normalized output suitable for copy, reuse, or debugging.
- Example input
- Attack at dawn!
- Example output
- Nggnpx ng qnja!
12letters+13shift
Non-letters (digits, punctuation) are left untouched.
Show all 26 shifts (brute-force preview)
Tool Introduction
Encode or decode text with the classic Caesar shift cipher. Adjust the shift from 0 to 25 with a slider, jump to ROT13, or scan a clickable brute-force list of all 26 shifts to crack a hidden message.
Tool Overview
The Caesar cipher shifts each letter a fixed number of positions through the alphabet. ROT13 is the well-known case where the shift is 13, which makes it self-inverse — encoding twice returns the original. Digits, punctuation, and spaces pass through untouched. This tool converts live as you move the slider, includes a ROT13 preset and an Invert button to flip the shift for decoding, and shows every one of the 26 possible shifts so you can pick the one that turns ciphertext into readable English. It is a classical cipher for puzzles and learning — it offers no real cryptographic security, since trying all 26 shifts breaks it instantly.
Use Cases
- Hide a spoiler or answer with ROT13 the way forums do
- Create or solve a Caesar-cipher puzzle for a class or escape room
- Brute-force an unknown shift to reveal a hidden message
- Demonstrate how a substitution cipher works while teaching cryptography
- Quickly encode a short note that only needs casual obfuscation
Input/Output Examples
ROT13 (shift 13). Punctuation is left unchanged.
Input Intent
Attack at dawn!
Output Intent
Nggnpx ng qnja!
Decoding a shift of 3 (invert to -3).
Input Intent
Khoor Zruog
Output Intent
Hello World
FAQ
Is the Caesar cipher secure?+
No. It is trivially broken by trying all 26 shifts — exactly what the brute-force panel does. Treat it as a learning or puzzle tool, never as real cryptography.
How do I decode a message?+
Use the Invert button to flip your current shift, or open the brute-force list and click the row whose output reads as normal text.
What is ROT13?+
ROT13 is a Caesar cipher with a shift of 13. Because the alphabet has 26 letters, applying it twice returns the original text, which is why forums use it to hide spoilers.
Does it shift non-English letters?+
The shift applies only to the 26 letters A–Z (in either case). Digits, punctuation, spaces, and characters from other alphabets pass through unchanged.
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