UUID Generator
Generate random UUIDs (v4) for your applications. Copy with one click.
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About UUID v4
UUID v4 (Random) generates unique identifiers using random or pseudo-random numbers. This is the most commonly used UUID version.
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
- 4 - indicates version 4
- y - can be 8, 9, a, or b (variant)
- x - random hexadecimal digit
Statistics
Fun Facts
- Total possible UUIDs: 2122 (≈ 5.3×1036)
- Collision probability is astronomically low
- Used in databases, APIs, and distributed systems
- No central authority needed
This UUID generator creates random version-4 UUIDs (also called GUIDs) in your browser. A UUID is a 128-bit identifier written as 32 hexadecimal digits in the 8-4-4-4-12 pattern, for example f47ac10b-58cc-4372-a567-0e02b2c3d479.
What is a version-4 UUID?
Version 4 UUIDs are built from random data — 122 random bits, which makes accidental collisions astronomically unlikely. That randomness makes them perfect for database primary keys, request IDs and idempotency keys, without any central coordinator handing out numbers.
UUID versions
- v4 (random) — what this tool generates; the most common choice.
- v1 (time-based) — derived from a timestamp and node identifier.
- v5 (name-based) — a deterministic hash of a namespace and name.
To understand the trade-offs, see our guide to UUIDs and GUIDs.