RSA Tools
Key pairs, encrypt, decrypt
100% local — nothing is uploaded
1 · Key pair
Generate a key pair, or paste existing keys below.
2 · Encrypt
Ciphertext (Base64)
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3 · Decrypt
Plaintext
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RSA-OAEP with SHA-256. Keys are generated and used entirely in your browser (Web Crypto API). Ciphertext size equals the key size; OAEP limits plaintext to 190 bytes with this key — encrypt a random AES key for larger data.
How to use
- Generate a key pair (or paste an existing private key).
- Encrypt text with the public key.
- Decrypt with the private key.
FAQ
Which encodings are supported?
Keys export/import as PEM (PKCS#8 / SPKI); ciphertext is Base64.
Can I decrypt elsewhere?
Yes — standard RSA-OAEP with SHA-256 is interoperable with OpenSSL and other tools.