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Secure Random Generator

Generate cryptographically secure random values: hex, bytes, numbers, UUIDs.

How to Use Secure Random Generator

1

Choose output format

Select hexadecimal, Base64, or decimal format depending on your use case. Hex is common for tokens, Base64 for encoding.

2

Set the length

Choose how many random bytes to generate. Common lengths: 16 bytes (128-bit), 32 bytes (256-bit), or 64 bytes (512-bit).

3

Generate and copy

Click generate to create your secure random value. Copy it to your clipboard with one click or regenerate for a new value.

About Secure Random Generator

Secure random generator online — generate cryptographically secure random values in hex, Base64, or decimal format instantly for free. Uses the Web Crypto API (crypto.getRandomValues) for true cryptographic randomness suitable for security applications. Generate random bytes for API tokens, session IDs, encryption keys, nonces, and security secrets. Customizable output length for any requirement. Ideal for developers, security professionals, and anyone needing unpredictable random values. All generation happens locally in your browser.

Key Features

  • Generate cryptographically secure random values using the Web Crypto API for true randomness
  • Output in multiple formats: hexadecimal, Base64, and decimal for different use cases
  • Customizable output length from a few bytes to hundreds for tokens, keys, and nonces
  • Suitable for generating API tokens, session IDs, encryption keys, and security nonces
  • One-click copy to clipboard and regenerate for fast repeated secure value generation
  • 100% private — all random generation happens in your browser, values are never sent to any server

Frequently Asked Questions

How to generate a secure random token online?▾
Select your preferred format (hex or Base64), set the length to at least 32 bytes for security, and click generate. The result is a cryptographically secure token suitable for API keys and sessions.
How to generate a random API key?▾
Generate a 32-byte (256-bit) random value in hexadecimal or Base64 format. This provides sufficient entropy for a secure API key that is practically impossible to guess.
How to generate random bytes for encryption?▾
Set the length to match your encryption needs (16 bytes for AES-128, 32 bytes for AES-256) and generate in hex format. Values use the Web Crypto API for true randomness.
How to generate a secure session ID?▾
Generate at least 16 bytes (128 bits) of random data in hex or Base64 format. This provides enough entropy to prevent session prediction attacks.
How to generate a cryptographic nonce?▾
Set the length to 12-16 bytes and generate in hex format. Nonces must be unique for each operation — our generator produces unpredictable values suitable for this purpose.
How to generate random hex strings?▾
Select hexadecimal output format and choose your desired byte length. Each byte produces 2 hex characters, so 16 bytes gives you a 32-character hex string.
How secure are the generated values?▾
Values use the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure pseudo-random numbers. This is the same source used for TLS and other security protocols in browsers.
How to generate a random Base64 string?▾
Select Base64 output format and set your desired length. Base64 encoding is URL-safe and commonly used for tokens in web applications and APIs.