RSA Decrypt

Decrypt RSA-OAEP ciphertext with a private key.

Private Key (PEM)

Ciphertext (Base64)

Note: RSA-OAEP with SHA-256 is used. Messages longer than about 190 bytes are split into chunks automatically. All processing runs locally in your browser.

What Is a RSA Decrypt?

The RSA Decrypt tool decrypts RSA-OAEP ciphertext with a PEM private key. Only the private key that matches the public key used for encryption can recover the original plaintext.

How to Use This RSA Decrypt

1
Paste Private KeyPaste the PEM private key (BEGIN PRIVATE KEY).
2
Paste CiphertextPaste the base64 ciphertext produced by the RSA Encrypt tool.
3
DecryptClick Decrypt to reveal the plaintext.

Frequently Asked Questions

The private key does not match the public key, the ciphertext was tampered with, or the PEM was pasted incorrectly.

Everything runs locally in your browser, but you must still store your private key securely and never share it with anyone.

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