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Certificate CSR Generator & Format Converter

Generate Certificate Signing Requests, convert between PEM/DER/PFX/P7B formats, and verify certificate chains - 100% client-side for maximum security

Generate Certificate Signing Request

Certificate Details

Subject Alternative Names (SANs)

Private Key Protection

Self-Signed Certificate Options

About This Tool

This Certificate CSR Generator & Format Converter is a complete client-side tool for managing SSL/TLS certificates. All cryptographic operations are performed locally in your browser using the Web Crypto API and PKI.js library.

Key Features:

  • Generate Certificate Signing Requests (CSRs) with RSA or ECDSA keys
  • Create self-signed certificates for testing environments
  • Import certificates in PEM, DER, PFX, and P7B formats
  • Convert between all major certificate formats
  • Verify certificate chains and signatures
  • Validate certificate-key pair matching
  • iOS-compatible PFX export with TripleDES encryption

Supported Formats:

  • PEM - Text format, common on Linux/Apache/Nginx
  • DER - Binary format, common on Windows
  • PFX/PKCS#12 - Password-protected bundle with cert + key + chain
  • P7B/PKCS#7 - Certificate chain without private key
  • CER/CRT - Can be PEM or DER format

🔒 Security & Privacy

Your private keys never leave your device. All operations are performed entirely in your browser. No data is transmitted to any server. This tool runs completely offline once loaded.

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Frequently Asked Questions

Common questions about the Certificate CSR Generator & Format Converter

Yes. All operations are performed 100% client-side in your browser using the Web Crypto API and PKI.js library. Your private keys never leave your device and are never transmitted to any server.

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⚠️ Security Notice

This tool is provided for educational and authorized security testing purposes only. Always ensure you have proper authorization before testing any systems or networks you do not own. Unauthorized access or security testing may be illegal in your jurisdiction. All processing happens client-side in your browser - no data is sent to our servers.