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RSA Encryption - Free RSA Encrypt Decrypt Online

Encrypt and decrypt data using RSA asymmetric encryption with this free online tool. Generate RSA public and private key pairs, then encrypt with public key or decrypt with private key. Supports PKCS#1 and OAEP padding. Fast accurate browser-based RSA cryptosystem tool.

Private key hidden

How to Use RSA Encryption Tool

Quick Start Guide

1

Click 'Generate Keys' to create RSA public/private key pair.

2

Enter your text and select padding scheme (PKCS#1 or OAEP).

3

Click 'Encrypt' with public key or 'Decrypt' with private key.

4

Copy the result or save your keys securely.

💡Pro Tips

✓Always keep your private key secure and never share it
✓Use 2048-bit or higher keys for production environments
✓RSA is best for encrypting small amounts of data (like symmetric keys)
✓For large files, use hybrid encryption (RSA + AES)

Frequently Asked Questions

RSA (Rivest-Shamir-Adleman) is an asymmetric encryption algorithm that uses a pair of keys: a public key for encryption and a private key for decryption. It's widely used for secure data transmission and digital signatures.
RSA works by generating two mathematically related keys. Data encrypted with the public key can only be decrypted with the corresponding private key. The security relies on the difficulty of factoring large prime numbers.
For most applications, 2048-bit keys provide adequate security. For high-security environments, use 4096-bit keys. Avoid 1024-bit keys as they are considered weak by modern standards.
RSA is not efficient for large files due to its slow speed and size limitations. For large data, use hybrid encryption: encrypt the data with AES (symmetric), then encrypt the AES key with RSA.
Yes, RSA is secure when properly implemented with adequate key sizes (2048+ bits). However, quantum computers could potentially break RSA in the future, so post-quantum cryptography is being developed.
RSA is asymmetric (uses two keys) and slower, while AES is symmetric (uses one key) and faster. RSA is ideal for key exchange and digital signatures, while AES is better for bulk data encryption.

Still have questions? Check out our other tools or contact us for support.

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