CSR Generator

What is a CSR Generator?

Generate an official Certificate Signing Request (`.csr) and matching <a href="https://en.wikipedia.org/wiki/RSA_(cryptosystem)" target="_blank" rel="noopener noreferrer" class="text-indigo-600 dark:text-indigo-400 font-semibold hover:underline" title="Learn more about RSA on official docs">RSA</a> private key (.key`) for obtaining SSL/TLS certificates from Certificate Authorities (DigiCert, Sectigo, GoDaddy). Configures Common Name (CN), Organization (O), Country (C), and Subject Alternative Names (SANs).

Why Use This Tool?

SSL/TLS Certificate Purchasing: Create CSR code required when buying commercial SSL certificates.
Wildcard & Multi-Domain SSL: Include multiple domain names and wildcards (`*.yourdomain.com`) in SAN fields.
Browser-Local Key Security: Generate CSRs and private keys locally without sharing keys with third-party vendors.

How to Use

Enter Domain Name (Common Name e.g. `example.com`), Organization, Country, and SANs.
Select Key Size (2048 or 4096 bits).
Click Generate CSR to receive `.csr` text and `.key` private key.

Real Working Example

Input:

Common Name: devdeskapp.com | Organization: DevDesk | Country: US | Key: 2048 bits

Output Result:

CSR Code:
-----BEGIN CERTIFICATE REQUEST-----
MIICvDCCAaQCAQAwdzELMAkGA1UEBhMCVVM...
-----END CERTIFICATE REQUEST-----

Private Key:
-----BEGIN PRIVATE KEY-----
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgw...

Important Technical Details & Security Standards

PKCS#10 CSR Standard Compliance: Generates RFC 2986 PKCS#10 certificate signing requests.
SAN Extension Support: Includes Subject Alternative Name extensions for multi-domain SSL compatibility.
100% Client-Side Memory: Private keys and CSRs are generated 100% locally inside browser memory.

Related Security & Crypto Tools

X.509 Certificate Decoder: Decode SSL certificates.
Self-Signed Certificate Generator: Create self-signed TLS certificates.
RSA Key Pair Generator: Generate RSA key pairs.

Frequently Asked Questions

What is a CSR (Certificate Signing Request)?

A CSR is an encoded block of text containing domain details and a public key submitted to a Certificate Authority to issue an SSL certificate.

Should I share my private key (.key) with the Certificate Authority?

No! Never send your private key to anyone. Submit only the CSR text block (.csr) to the Certificate Authority.

What is Common Name (CN)?

Common Name is the primary fully qualified domain name (FQDN) you want to secure (e.g. example.com).

Is it free?

Yes, 100% free.

Are generated CSR private keys saved on a server?

No, all generation happens 100% locally in your web browser.

Does it support wildcard SSL certificates?

Yes, enter `*.yourdomain.com` in the Common Name or SAN field.