What is the Affine Cipher tool?

Linear transformation encryption (ax+b mod 26). This free online tool is available at NumbersChecker with no login required.

Is the Affine Cipher tool free?

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

How do I use the Affine Cipher tool?

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

Is there an API for the Affine Cipher tool?

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

Ciphers linearmodularencrypt

Affine Cipher

Linear transformation encryption (ax+b mod 26).

About the Affine Cipher Tool

Linear transformation encryption (ax+b mod 26). 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: linear · modular · encrypt

API usage

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

{
  "text": "your input here"
}