Free Toolkit

CSR GeneratorGenerate Certificate Signing Requests with RSA key pairs.

CSR Generator illustration
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CSR Generator

Generate Certificate Signing Requests with RSA key pairs.

How to Use
1

Domain

Enter domain and org.

2

Key Size

2048/4096.

3

Generate

Create CSR.

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 Our CSR Generator?

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

Common Use Cases

SSL

CSR for CA.

Dev

Test CSRs.

Learning

CSR structure.

Renewal

New CSR.

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

QFree?
Yes.
QKey safe?
Yes.
QProduction?
Use openssl.
QSizes?
2048/4096.
QMobile?
Yes.

About CSR Generator

CSR Generator is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.