Quick Answer
UUID v4 uses random/pseudo-random numbers. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where 4 indicates version and y is 8, 9, a, or b.
Quick Template
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About UUID v4 Generator Online
How to Generate UUIDs
- Click the generate button (or it generates automatically)
- Copy the UUID with one click
- Generate multiple UUIDs if needed
- Use in your application, database, or API
UUID v4 Format
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx- 8-4-4-4-12 character groups
- The
4indicates version 4 yis one of: 8, 9, a, or b- All other positions are random hex characters
Use Cases
- Database IDs: Primary keys for records
- API Requests: Correlation and tracking IDs
- File Names: Unique uploads without conflicts
- Sessions: User session identifiers
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