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UUID Generator – Generate Unique Identifiers

Generate UUIDs (v1, v4, v7) with bulk generation, validation, and various output formats for databases and applications.

🟢 Runs locally · no uploads
Generated UUIDs (1)

Output will appear here

Format: text

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Tip: v4 is recommended for most use cases. v1 includes timestamp but exposes MAC address. v7 is time-sortable without privacy concerns.

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› About this tool · FAQ

Stop manually creating unique identifiers! Generate UUID/GUID instantly for database records, API requests, and distributed systems. Supports v1 (timestamp), v4 (random), and v7 (time-sortable) formats with bulk generation up to 1000 IDs. Free, works offline, cryptographically secure.

How do I generate a UUID?

Select UUID version (v1, v4, or v7), configure format options (uppercase, braces, hyphens), set quantity if needed, and click Generate. The tool creates cryptographically secure UUIDs instantly ready for use in databases, APIs, or applications.

Is this UUID generator free?

Yes, completely free with unlimited generation. No signup required, no watermarks. Generate up to 1000 UUIDs at once with all processing happening in your browser for complete privacy.

Are generated UUIDs uploaded to servers?

No, all UUID generation happens locally in your browser using Web Crypto APIs. UUIDs never leave your computer, ensuring complete privacy for your unique identifiers.

What's the difference between UUID versions?

v1 uses timestamp + MAC address (traceable), v4 is random (most common and recommended), v7 is timestamp-based but more privacy-friendly than v1 with better database performance.

Are UUIDs truly unique?

UUIDs have extremely low collision probability. v4 UUIDs have about 1 in 5.3 billion chance of collision when generating 1 billion UUIDs, making them effectively unique for practical purposes.

Should I use UUID or GUID?

UUID and GUID are essentially the same thing. GUID is Microsoft's term, UUID is the RFC standard term. They're interchangeable and use the same format.

Which UUID version should I use?

Use v4 for general purposes (random), v1 if you need time ordering but don't mind MAC address exposure, v7 for time-ordered with better privacy and database indexing performance.

Can I use UUIDs as database primary keys?

Yes, but consider performance implications. UUIDs are larger than integers and can cause index fragmentation. Use binary storage format (BINARY(16) in MySQL) when possible for better performance.