Is RSA Key Generator free to use?

Yes, RSA Key Generator is completely free to use. No registration or login required — all features are available directly.

Does RSA Key Generator upload my data to a server?

No. RSA Key Generator uses pure front-end technology. All processing happens in your browser — no data is uploaded to any server. The tool works even without an internet connection.

Can I use RSA Key Generator on my phone?

Yes. RSA Key Generator is fully responsive and works on phones, tablets, and desktops. The interface automatically adapts to your screen size.

Do I need to install any software to use RSA Key Generator?

No. RSA Key Generator is an online tool — just open the webpage in your browser. No downloads, plugins, or installations needed.

Is my data safe when using RSA Key Generator?

Yes. Since all data is processed locally in your browser and never sent to any server, there is no risk of data leakage. Your data stays under your control at all times.

Are there any usage limits for RSA Key Generator?

RSA Key Generator is a free online tool with no usage limits. Since processing is done locally, performance depends on your device. For very large files, we recommend processing in batches for the best experience.

Free RSA Key Generator

⚙️ Key Parameters

Key Length：

🔓 Public Key PEM Format

Click "Generate Key"

🔒 Private Key PEM Format · Keep Secure

Click "Generate Key"

📖 What is RSA Key for?

RSA is a type of asymmetric encryption algorithm, using key pair: public key and private key.

🔓

Public — Can be shared publicly
Used for encryption

⟶

🔒

Private — Must be protected
Used for decryption and signing

How it works: Anyone can use your public key to encrypt data, but only the holder of the private key can decrypt it. You can also use the private key to sign data, and others use the public key to verify the signature.

🔧 RSA Common Use Cases

SSH authentication — Generate SSH key pair, secure login to servers
SSL/TLS certificates — Network HTTPS encryption
JWT signature — Using RS256 algorithm for JSON Web Token signing
Digital signature — Validate data package and text file integrity and authenticity
PGP/GPG email encryption — Email encryption base

❓ FAQ

Which key length should I choose?

2048-bit is the current standard, offering good security and performance. 4096-bit provides higher security but generation and computation are slower. 1024-bit is no longer secure and should not be used.

Will my data be uploaded to a server?

No. All tools run completely in the browser, using the Web Crypto API to generate keys. The private key never leaves your device.

Can generated keys be used for SSH login?

Yes. The generated PEM format private key can be used directly in SSH. The public key needs to be converted to OpenSSH format (ssh-rsa AAAA...), you can use: ssh-keygen -i -f public_key.pem -m PKCS8

What is PEM format?

PEM (Privacy-Enhanced Mail) is a Base64-encoded key file format, starting with "-----BEGIN ... KEY-----" and ending with "-----END ... KEY-----". It is the most common key storage and usage format.

Which browsers are supported?

All modern browsers (Chrome 60+, Firefox 60+, Edge 79+, Safari 11+) fully support the Web Crypto API. IE is not supported.

🔑 RSA Key Generator