Free Online UUID v4 Generator
Generate random UUID v4 (universally unique identifiers) in bulk with HubKit's UUID generator. UUIDs are 128-bit identifiers used as primary keys in databases, request IDs in APIs, session tokens, and unique identifiers in distributed systems where sequential IDs are impractical.
How to Use
Set the number of UUIDs to generate (1–100). Toggle uppercase and hyphens options as needed. Click Regenerate for a fresh batch. Click any UUID to copy it, or use Copy All to copy the entire list.
Features
- Generate 1 to 100 UUID v4 values at once
- Toggle between uppercase and lowercase format
- Option to include or remove hyphens
- Click to copy individual UUIDs or the full batch
Frequently Asked Questions
What is a UUID v4?
UUID v4 is a 128-bit identifier generated using random or pseudo-random numbers. It follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where 4 indicates version 4 and y is 8, 9, a, or b.
Are UUID v4 values truly unique?
While not guaranteed unique, the probability of a collision is astronomically low — about 1 in 2^122 (5.3 × 10^36). In practice, you can treat them as unique for all purposes.
Should I use UUIDs or auto-increment IDs in my database?
UUIDs are better for distributed systems, preventing ID conflicts across services. Auto-increment IDs are simpler and more storage-efficient for single-database applications. Many teams use UUIDs as public-facing IDs alongside internal auto-increment keys.