UUID Generator

Generate random UUIDs/GUIDs.

Quickly generate random UUIDs and GUIDs with copy-to-clipboard support.

🔑 The Universal Unique Identifier

UUIDs were standardized in the 1990s to solve a fundamental distributed systems problem: how do you generate unique IDs without a central authority? The answer: make the ID space so large that collisions are astronomically unlikely.

🤯 Wacky Facts

• A UUID has 340 undecillion (340,282,366,920,938,463,463,374,607,431,768,211,456) possible values
• If you generated 1 billion UUIDs per second, it would take 100 billion years to have a 50% chance of collision
• GUIDs (Microsoft's term) and UUIDs are exactly the same thing
• Version 1 UUIDs contain your MAC address—a privacy concern!
• The dashes in UUIDs are optional—they're just for readability

💡 Useful Tips

• Use Version 4: Random UUIDs (v4) are the safest—no embedded information
• Don't use for security: UUIDs aren't cryptographically secure—use proper tokens
• Database performance: Random UUIDs can fragment indexes—consider ordered UUIDs (v7)
• Lowercase convention: Most systems prefer lowercase hex digits
• URL-safe alternatives: Consider base64 encoding for shorter URL-friendly IDs

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