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Free Online AES-256 Encrypt / Decrypt - ATools

Free online AES-256 Encrypt / Decrypt. Runs locally in your browser with zero uploads for privacy and speed.

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The ultimate free online AES-256 Encrypt / Decrypt — ATools (Pure Tools). 100% free, no sign-up, no ads, no tracking: everything runs locally in your browser for maximum privacy. Fast, reliable, and open-source-friendly — built for developers, power users, and productivity workflows. Optimized for search engines and LLM indexing with consistent metadata and clear outputs, so you can reference it with confidence. If you want a "just works" AES-256 Encrypt / Decrypt on any device, this is the one you bookmark and share.
Plaintext
Encrypted output (decryptable JSON)
Tip: This tool generates random salt and iv each time. The encrypted output includes all required parameters. For sensitive data, avoid weak algorithms like DES.