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Generate CSR and Private Key Online Generate Certificate Signing Requests with RSA key pairs.

CSR Generator illustration
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CSR Generator

Generate Certificate Signing Requests with RSA key pairs.

1

Domain

Enter your domain as the Common Name and organization details.

2

Key Size

Choose 2048 or 4096 bits for RSA key strength.

3

Generate

Click to create the CSR and private key.

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What Is CSR Generator?

A CSR is sent to a CA to apply for an SSL/TLS certificate, containing public key and identifying info. This tool generates RSA key pair and CSR output. For production, use openssl for full X.509 compliance.

Why Use CSR Generator?

  • Quick CSR with key pair
  • Configurable fields
  • 2048/4096 RSA
  • 100% client-side

Common Use Cases

SSL

Submit the CSR to a CA to obtain an SSL/TLS certificate.

Dev

Generate test CSRs for development and staging.

Learning

Understand CSR structure and certificate request flow.

Renewal

Create a new CSR when renewing an existing certificate.

Technical Guide

RSA RSASSA-PKCS1-v1_5/SHA-256. Exports SPKI/PKCS#8. Subject DN from CN, O, C. PEM CERTIFICATE REQUEST headers.

Tips & Best Practices

  • 1
    CN = domain
  • 2
    Keep private key secure
  • 3
    RSA-2048 min
  • 4
    openssl for production

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Frequently Asked Questions

Q Free?
Yes. The tool is free to use.
Q Key safe?
Yes. Keys are generated in your browser and never leave your device.
Q Production?
Use openssl for production certificates; it offers full X.509 compliance.
Q Sizes?
2048 or 4096 bits. Both are supported.
Q Mobile?
Yes. Works on mobile browsers.

About This Tool

CSR Generator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.