UUID/GUID Generator
How this tool works
What it accepts, how to use it, and where your input is processed.
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How this tool works
What it accepts, how to use it, and where your input is processed.
High-Entropy UUID v4
Generate secure, unique identifiers instantly with our Online UUID v4 Generator. RFC 4122 compliant identifiers with virtually zero collision risk.
Standard
RFC 4122 v4
Entropy Bits
122 Random Bits
Collision Risk
Virtually Zero
What is a UUID v4?
A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. Version 4 is generated using cryptographically strong random numbers.
Unlike v1, v4 doesn't leak MAC addresses or timestamps, making it the preferred choice for privacy and security.
Distributed Systems
In distributed databases like Cassandra or MongoDB, UUIDs allow multiple nodes to generate IDs independently without a central coordinator, eliminating performance bottlenecks.
Format Comparison
| Format | Length | Collision Risk | Primary Use |
|---|---|---|---|
| UUID v4 | 36 chars | Extremely Low | Distributed DBs |
| GUID | 36 chars | Extremely Low | Microsoft OS |
| Nanoid | 21 chars | Low | URL-Friendly IDs |
Related tools
Open after you finish the primary task.
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Related tools
Open after you finish the primary task.
Generate time-based Version 1 UUIDs for unique identification within a specific timeframe.
Generate Version 3 UUIDs using MD5 hashing of a namespace and a specific name.
Generate Version 5 UUIDs using SHA-1 hashing of a namespace and a specific name.