UUID Generator — Generate v4 UUIDs
Generate RFC 4122 compliant UUID v4 (universally unique identifiers) instantly. Generate one at a time or bulk generate multiple UUIDs for testing and development.
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UUID Generator
DeveloperFree · No signup
Generated UUIDs
Guide
How to Use UUID Generator
Set Count
Choose how many UUIDs to generate (1 to 100).
Generate
Click "Generate" to create fresh random UUID(s).
Copy
Copy individual UUIDs or click "Copy All" for bulk generation.
Frequently Asked Questions
UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUID v4 uses random values.
UUID v4 has 2^122 possible values — about 5 undecillion. The probability of generating two identical UUIDs is astronomically low (around 1 in 5.3 × 10^36). It's effectively unique for all practical purposes.
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical and compatible.
UUID v1 uses timestamp + MAC address (not privacy-friendly). UUID v4 is fully random, better for most applications where you don't need timestamp ordering. UUID v7 (newer) combines both.
Yes, but with tradeoffs. UUIDs ensure globally unique keys across distributed systems but are larger than integers and can cause index fragmentation in sequential databases.