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Cryptography

RSA & ECDSA Key Pair Generator

Generate RSA and ECDSA public/private key pairs in PEM format securely in browser

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How to Use RSA & ECDSA Key Pair Generator

  1. Select the cryptographic algorithm (RSA or ECDSA).
  2. Choose your desired key length (e.g. 2048-bit or 4096-bit) or curve (e.g. P-256).
  3. Click Generate to create a new key pair instantly.
  4. Copy the PEM strings or download them as .pem files.

Frequently Asked Questions

Are the private keys sent to your server?

No. The key pairs are generated using window.crypto.subtle directly on your device. The private keys never leave your browser.

What format are the exported keys in?

Public keys are exported in SPKI PEM format (-----BEGIN PUBLIC KEY-----) and private keys are in PKCS#8 PEM format (-----BEGIN PRIVATE KEY-----).

Sources & References

Primary references: W3C Web Cryptography API; RFC 7468: Textual Encodings of PKIX Structures.

Review policy: references and behavior notes are checked whenever the tool implementation changes.