Crypto Random Generator

Generate cryptographically secure random data
This free online crypto random generator runs in your browser and is part of our Cryptography collection.

🎲 Crypto Random Generator

Generate cryptographically secure random data using the Web Crypto API

About Cryptographic Random Generation:

  • Secure: Uses crypto.getRandomValues() for cryptographically secure random data
  • Unpredictable: Suitable for security-sensitive applications like keys, tokens, and nonces
  • Formats: Output as hexadecimal, base64, or raw byte array
  • Use Cases: API keys, session tokens, initialization vectors, salt values
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Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online Crypto Random Generator

1 Choose Random Output Format

Select Hexadecimal, Base64, Alphanumeric string, or Raw Integer sequences.

2 Specify Output Length & Quantity

Set total byte count or character length (e.g. 16, 32, 64 bytes) and number of random tokens to generate.

3 Generate Cryptographically Secure Entropy

Click "Generate" to invoke the operating system CSPRNG entropy pool via `window.crypto.getRandomValues`.

4 Copy Keys or Tokens

Copy the generated random keys with one click for session secrets, API tokens, salts, or encryption IVs.

Frequently Asked Questions

Common questions about using this free online crypto random generator.

What makes `window.crypto.getRandomValues` better than `Math.random()`? ▾
`Math.random()` uses pseudo-random algorithms (like xorshift128+) that are predictable and cryptographically insecure. `crypto.getRandomValues()` draws entropy from hardware noise and OS kernel entropy pools, making prediction statistically impossible.
Can I use these random values for cryptographic keys and tokens? ▾
Yes. These random bytes meet NIST and FIPS requirements for symmetric encryption keys (AES-256 requires 32 bytes), session tokens, salts, and nonces.
Is there any limit to the byte length I can generate at once? ▾
The Web Crypto API supports up to 65,536 bytes (64 KB) in a single synchronous call. For larger streams, chunked buffers are combined seamlessly.
Are generated random strings logged or stored anywhere? ▾
No. Generation executes strictly inside browser RAM and is discarded as soon as you close or reload the page.

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