RSA Encrypt & Decrypt
Free online RSA encryption and decryption tool. Encrypt messages with RSA public keys and decrypt with private keys directly in your browser. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.
Free
Client-Side
No Login
No Storage
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How to Use the RSA Encrypt & Decrypt
- Encrypt: Paste an RSA public key (PEM) and plaintext, then click Encrypt.
- Decrypt: Paste an RSA private key (PEM) and the Base64 ciphertext, then click Decrypt.
RSA encryption uses the Web Crypto API (RSA-OAEP with SHA-256). Maximum message size depends on key size (e.g., ~190 bytes for 2048-bit keys). Generate key pairs using the RSA Key Generator tool.
What is RSA Encrypt & Decrypt?
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