RSA-OAEP Encrypt & Decrypt

Use browser-local RSA-OAEP with SHA-256 and visible plaintext size limits for interoperable public-key encryption.

Public key (SPKI PEM)

Private key (PKCS#8 PEM)

Plaintext

Ciphertext (Base64)

ReadyRSA-OAEP · SHA-256. A 2048-bit key allows up to 190 plaintext bytes.

All cryptographic operations run locally in your browser. Keep private keys secret and use production key-management practices for real systems.

How to use this RSA-OAEP Encrypt & Decrypt

Encrypt short text with an RSA public key and decrypt it with the matching private key. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.