Encrypt "Hello World"
plaintext = Hello WorldpublicKey = {"kty":"RSA","n":"...","e":"..."}
Result: Base64-encoded ciphertext.
RSA-OAEP Encryption
Encrypt data using RSA-OAEP with SHA-256. Paste your public key (JWK format) and plaintext to encrypt. The ciphertext can only be decrypted with the matching private key.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What is RSA-OAEP?
RSA-OAEP is a padding scheme for RSA encryption that provides semantic security. It uses Optimal Asymmetric Encryption Padding with SHA-256 hash function.
Can I decrypt without the private key?
No. RSA encryption is asymmetric - only the holder of the matching private key can decrypt the ciphertext.
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