happytails.ai

Caesar cipher encoder and decoder

Open Caesar cipher encoder and decoder on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "caesar-cipher",
  "category": "text-tools",
  "built": true,
  "requirements": "Shifts A–Z while preserving case, spaces and punctuation. Shift 13 is ROT13. This historical cipher is easily broken and must not be used to protect secrets.",
  "implementation": {
    "fields": [
      {
        "key": "shift",
        "label": "Shift (use a negative value to decode)",
        "value": 13,
        "type": "number",
        "min": -25,
        "max": 25,
        "step": 1
      }
    ],
    "live": true,
    "note": "Shifts A–Z while preserving case, spaces and punctuation. Shift 13 is ROT13. This historical cipher is easily broken and must not be used to protect secrets.",
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "Change the input or settings to update your result.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Shift letters to create or solve a simple cipher puzzle.

How to use Caesar cipher encoder and decoder
  1. Enter text and choose a shift from -25 to 25. Use the opposite shift to decode. A shift of 13 is ROT13 and applying it twice restores the original.
  2. With shift 13, Hello, World! becomes Uryyb, Jbeyq!. Punctuation and capitalization are preserved.

Useful next steps

Vigenère cipher encoder and decoderMorse code translatorReverse text

How to use it

Enter text and choose a shift from -25 to 25. Use the opposite shift to decode. A shift of 13 is ROT13 and applying it twice restores the original.

Try a small example

With shift 13, Hello, World! becomes Uryyb, Jbeyq!. Punctuation and capitalization are preserved.

What to know

Shifts A–Z while preserving case, spaces and punctuation. Shift 13 is ROT13. This historical cipher is easily broken and must not be used to protect secrets.