Free UUID Generator
Generate UUID v4 identifiers with cryptographic randomness. Bulk generation up to 100. Free, no signup.
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How to Generate UUIDs Online
Click Generate to create one or more UUID v4 identifiers. You can generate up to 100 UUIDs at once and choose from multiple formats: standard lowercase with hyphens, uppercase, without hyphens, or wrapped in braces. Each UUID is generated using the Web Crypto API (crypto.getRandomValues) for true cryptographic randomness.
Why Use Our UUID Generator?
UUIDs (Universally Unique Identifiers) are essential in software development for creating unique database keys, session tokens, correlation IDs, and more. Our generator uses the cryptographically secure Web Crypto API — not Math.random — ensuring each UUID has genuine randomness. Everything runs in your browser with no server communication.
Frequently Asked Questions
What is a UUID v4? UUID version 4 is a randomly generated 128-bit identifier. The format is 8-4-4-4-12 hexadecimal characters (e.g., 550e8400-e29b-41d4-a716-446655440000). Version 4 UUIDs have specific bits set to indicate the version and variant.
Are these UUIDs truly random? Yes. We use crypto.getRandomValues, which provides cryptographically secure random numbers. The probability of generating two identical UUIDs is astronomically small (about 1 in 5.3 × 10^36).
Can I use these UUIDs in production? Absolutely. The generation method is cryptographically secure and follows the RFC 4122 specification for version 4 UUIDs.