Generate an AES-256 key
bits = 256count = 1
Result: A 64-character hex string representing a 256-bit AES key.
AES Key Generator
Generate AES encryption keys using the browser's cryptographically secure random number generator (CSPRNG). Choose from AES-128, AES-192, or AES-256. Keys are displayed in hex format and can be directly used with AES-GCM encryption tools.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Which AES key size should I use?
AES-256 is recommended for most applications. It provides a security margin well beyond what any known attack can reach. AES-128 is also secure but has a smaller margin. AES-192 is rarely used in practice.
Is my key stored anywhere?
No. The key is generated in your browser's memory and never stored, logged, or transmitted. Copy it immediately - refreshing the page generates new keys.
Can I use this key with the AES-GCM tools?
Yes. Copy the generated key and paste it into the AES-GCM Encrypt tool. The key format (hex) is compatible.
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