Encrypt and decrypt text with RSA-OAEP public/private keys, including hybrid mode for longer messages. This RSA Encrypt is part of our free developer tools collection on freetoolstouse. It runs entirely in your browser, so your files and inputs stay on your device unless the tool explicitly performs a network check (for example DNS or SSL lookups). There is no signup, no watermark, and no usage cap. Use it whenever you need a fast, accurate result without installing software.
Encrypt and decrypt text with RSA-OAEP public/private keys, including hybrid mode for longer messages.
RSA-OAEP encrypts short messages directly (about 190 bytes for 2048-bit keys). Longer text automatically uses hybrid RSA + AES-GCM.
Uses RSA-OAEP via the Web Crypto API. Keys and message data stay in your browser. Hybrid mode wraps a random AES-256 key for messages that exceed the RSA payload limit.
