Scan & Generate
Free UUID Generator
Generate random UUID v4 identifiers for databases, APIs, and testing. Create one or many at once.
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What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify resources across systems without coordination. Also known as GUIDs (Globally Unique Identifiers) in Microsoft ecosystems.
UUID v4 Format
UUID v4 uses random or pseudo-random numbers. The standard format is:
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Where x is any hex digit and y is one of 8, 9, a, or b. The 4 indicates version 4.
Common Use Cases
- Database primary keys — avoid sequential IDs that leak information
- API identifiers — unique resource IDs across microservices
- Session tokens — unique session identifiers
- File names — prevent collisions in storage systems
- Asset tracking — unique labels for physical items via QR codes
- Correlation IDs — trace requests across distributed systems
Encode UUIDs in QR Codes
The Scan & Generate app lets you create QR codes from UUIDs and scan them back — perfect for asset tracking and inventory.
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