RSA Encrypt/Decrypt Online - EXUtil Extended Utilities
Free online RSA asymmetric encryption and decryption tool. Generate RSA key pairs (1024/2048/4096-bit) and perform public key encryption, private key decryption.
How to use
- Paste or import the content you want to process.
- Choose an available action and run the tool.
- Review the result, then copy or download the output.
Frequently asked questions
- RSA key sizes?
- 1024 (insecure), 2048 (recommended), 4096 (highest security).
- Public vs private key?
- Public: encrypt/verify, can share. Private: decrypt/sign, must keep secret.
- RSA data length limit?
- ~1/8 of key length (256 bytes for 2048-bit). Use hybrid encryption (RSA+AES) for large data.
- RSA too slow?
- Use RSA to encrypt AES key, AES for actual data. Best of both worlds.
- How to store private key?
- HSM, key management systems, or encrypted files. Never hardcode in production.