Caesar Cipher Encoder & Decoder

Overview

• Purpose: Perform Caesar shifts on plaintext or ciphertext
• Input: Enter text in the Target plain text field
• Output: View the shifted result in the Result field

How to Use

1. Paste your text (e.g. hello world) into the top box.
2. Set the Shift value to the number of letters to rotate by.
3. Choose Encode or Decode from the dropdown.
4. Your transformed text appears in the Result box.
5. Click Copy or Download to export the output.

Common Scenarios

• Teaching basic encryption in classrooms
• Quick ROT13 transformations for puzzles
• Demonstrating cryptanalysis by brute-forcing shifts

Pro Tips

• 🔄 Use negative shifts (e.g. -1) to reverse an encode
• 🎯 A shift of 13 applies the standard ROT13 cipher
• 🔍 To crack unknown keys, try decoding with shifts 1-25