Cryptographic Key Generator
Generates cryptographically secure random values with crypto.getRandomValues: symmetric keys (128/256-bit), IVs and nonces, salts, and URL-safe API tokens. Output in hex, Base64, Base64url or a raw byte array, with the exact bit-length shown.
Runs 100% in your browser — keys and data never leave your device.
Read the full guide to this tool
Notes
- crypto.getRandomValues is a CSPRNG suitable for keys and tokens; Math.random is not and must never be used for anything security-sensitive.
- A 256-bit random key has 256 bits of entropy — far beyond anything brute-force can reach. Bigger is not more secure past the algorithm's key size.
- Runs 100% in your browser — keys and data never leave your device.
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