UUID Generator
Generates UUIDs v1, v4 and v7 for your applications
Generator Settings
Generated UUIDs
Click "Generate UUIDs" to start.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information.
UUID Versions
- v1: Time-based + MAC address
- v4: Fully random (122 bits of randomness)
- v7: Time-based + random, sortable
xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxxM=Version, N=VariantUse cases
- Database primary keys
- Session IDs
- API request IDs
- Filenames
- Tracking IDs
- Microservices
UUID Generator – Frequently Asked Questions
Is UUID v4 truly unique?
Yes, the probability of a collision is astronomically low. With 103 trillion v4 UUIDs the collision probability is roughly 1 in a billion.
Which version should I use?
UUID v4 is ideal for most cases. If you need sortable IDs, use UUID v7.
Can I use UUIDs as a primary key?
Yes, UUIDs are excellent primary keys, especially in distributed systems.
UUID vs. GUID – what is the difference?
GUID (Globally Unique Identifier) is Microsoft's term for UUID. Technically they are identical.
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