What is the Caesar Cipher tool?

Shift letters by a fixed number of positions. This free online tool is available at NumbersChecker with no login required.

Is the Caesar Cipher tool free?

Yes, the Caesar Cipher tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Caesar Cipher tool?

Enter your input into the form at https://numberschecker.com/tool/caesar, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Caesar Cipher tool?

Yes. Send a POST request to https://numberschecker.com/api/caesar with your input as a JSON body. The API is free and requires no authentication.

Ciphers shiftrotencryptdecrypt

Caesar Cipher

Shift letters by a fixed number of positions.

About the Caesar Cipher Tool

Shift letters by a fixed number of positions. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Ciphers category on NumbersChecker. Browse all Ciphers tools or explore all 139 tools.

Related: shift · rot · encrypt · decrypt

API usage

POST /api/caesar
Content-Type: application/json

{
  "text": "HELLO WORLD",
  "shift": 13
}