Decrypt a ciphertext
ciphertext = abc123...privateKey = {"kty":"RSA","n":"...","e":"...","d":"..."}
Result: The original plaintext.
RSA-OAEP Decryption
Decrypt data using RSA-OAEP with SHA-256. Paste your private key (JWK format) and the Base64 ciphertext to decrypt.
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 if I get a decryption error?
Decryption fails if the wrong key is used, the ciphertext is corrupted, or the ciphertext was not created with the matching public key.
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