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UUID v4 Generator
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Output
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How to Use
- Choose how many UUIDs to generate (1-100).
- Click Generate to create cryptographically random UUID v4 identifiers.
- Copy individual UUIDs or all at once.
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier that's guaranteed to be unique across space and time. UUID v4 uses random or pseudo-random numbers, making collisions statistically impossible (the probability of generating a duplicate is approximately 1 in 2^122).
UUID v4 Format
A UUID v4 looks like this: 550e8400-e29b-41d4-a716-446655440000. It's 36 characters long (32 hex digits + 4 hyphens), grouped as 8-4-4-4-12. The '4' in the third group identifies it as version 4 (random). UUIDs are commonly used as database primary keys, API resource identifiers, session tokens, and correlation IDs in distributed systems.