Encrypt / Decrypt

Encrypt and decrypt text using RSA-OAEP (public/private key) or AES-GCM (symmetric key) — all in-browser via Web Crypto

Your input is processed locally and never sent to our servers.

Plaintext

Public Key (PEM)

Ciphertext (Base64)

Algorithm: RSA-OAEP with SHA-256

Encrypt: requires a public key (SPKI / PEM). Anyone with the public key can encrypt.

Decrypt: requires the matching private key (PKCS#8 / PEM). Only the key holder can decrypt.

Limit: RSA-OAEP can only encrypt short messages (≤ key size − 66 bytes for 2048-bit keys ≈ 190 bytes). For larger data, use AES.