Caesar Cipher

Encrypt and decrypt text with the Caesar cipher — choose any shift value, use the classic ROT13, or see all 25 possible shifts at once.

What Does This Tool Do?

Encrypt and decrypt messages using the Caesar substitution cipher — shift every letter by a fixed number of positions. Includes one-click ROT13 and a table showing all 25 possible shifts at once for brute-force decoding.

Key Features

🔐
Any Shift 1–25
Full control over the shift value.
🔄
ROT13 Shortcut
One-click ROT13 (shift 13), the internet standard.
📊
All 25 Shifts
See every possible decryption at once.
📋
Copy Result
One-click copy of output.

How to Use

  1. Type or paste your text.
  2. Enter the shift value (or click ROT13 for shift 13).
  3. Click Encrypt to encode or Decrypt to decode.
  4. Or click All Shifts to see every possible decryption.

Frequently Asked Questions

How does the Caesar cipher work?▾
Each letter is shifted a fixed number of positions in the alphabet. With shift 3: A→D, B→E, C→F … Z→C. To decrypt, shift in the opposite direction.
What is ROT13?▾
ROT13 is a Caesar cipher with shift 13. Since the alphabet has 26 letters, ROT13 is its own inverse — apply it twice to return the original. Widely used online to hide spoilers.
How do I crack an unknown Caesar cipher?▾
Click "All Shifts" to see all 25 possible decryptions. The one that makes sense in English is the correct shift. This is called a brute-force attack.

Complete Guide to Caesar Cipher

When To Use This Tool

Use Caesar Cipher whenever you need fast, accurate output without installing software. This tool is designed for speed, clarity, and repeatable results for day-to-day work.

Best Practices for Accurate Results

  • Double-check the format of your input before running the tool.
  • Test with a small sample first, then process larger data.
  • Use Related Tools to verify, convert, or transform the output.

Why Users Prefer AdeDX

AdeDX tools are browser-based, free to use, and built to work across desktop and mobile devices. Most processing happens directly in your browser for fast performance and improved privacy.