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UUID Generator
Generate version 4 UUIDs
UUID v4 – the "random" version. Your browser's native `crypto.randomUUID()` makes these by filling 122 bits with pseudorandom noise and slapping on some version/variant flags. The chance of collision is about 1 in 5.3×10^36. You're more likely to be hit by a meteorite while winning the lottery. Twice.
UUID v4 Format
xxxxxxxx-xxxx-4xxx-[89ab]xxx-xxxxxxxxxxxx- • 4 indicates version 4 (random)
- • [89ab] indicates the variant
- • 122 bits of randomness
- • 36 characters total (32 hex digits + 4 hyphens)
About UUID Generator
What is UUID Generator?
Generate RFC 4122 compliant version 4 UUIDs. Create single or bulk UUIDs for use in databases, APIs, and applications. Copy with or without hyphens.
Features & Benefits
- RFC 4122 compliant
- Version 4 (random) UUIDs
- Bulk generation
- With/without hyphens
- One-click copy
- Cryptographically random
Frequently Asked Questions
- What is a UUID?
- A Universally Unique Identifier—a 128-bit value that's statistically guaranteed to be unique. Used for database IDs, session tokens, etc.
- Will UUIDs ever collide?
- Extremely unlikely. You'd need to generate 1 billion UUIDs per second for 86 years to have a 50% chance of one collision.
- UUID vs GUID?
- They're the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. Format and function are identical.
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100% Private & Secure
This tool runs entirely in your browser. Your files and data never leave your device and are not uploaded to any server.