About This Tool
What is UUID Generator?
A tool for generating UUIDs (Universally Unique Identifiers). UUIDs are used to create unique identifiers without collision in distributed systems. They are commonly used for database primary keys, API request IDs, and session tokens.
How to Use
- Select the UUID version (default is v4).
- Enter the number of UUIDs to generate.
- Click 'Generate' to instantly create UUIDs.
- Click on a generated UUID to copy it.
Key Features
- UUID v4 (random-based) generation
- Batch generation of multiple UUIDs at once
- One-click copy functionality
- Cryptographically secure random number generation in browser
Tips
- UUID v4 uses 122 bits of random data, making collision probability extremely low.
- Using UUIDs as database primary keys prevents ID collisions in distributed environments.
- The UUID format consists of hexadecimal digits in 8-4-4-4-12 pattern.
UUID Generator
Generate random UUID (v4)
Frequently Asked Questions
What is the probability of UUID v4 collisions?▼
With 122 random bits, you would need to generate about 2.71 quintillion (2.71 × 10^18) UUIDs to have a 50% chance of a single collision. For practical purposes, UUID v4 collisions are essentially impossible in real-world applications.
What is the difference between UUID versions (v1, v4, v7)?▼
UUID v1 uses timestamp + MAC address (sortable but reveals device info). UUID v4 is purely random (most popular, maximum privacy). UUID v7 (newer) uses timestamp + random data, combining sortability with randomness — ideal for database primary keys.
Should I use UUID or auto-increment IDs for database primary keys?▼
UUIDs are better for distributed systems since they can be generated independently without coordination. Auto-increment IDs are simpler and more storage-efficient for single-database setups. UUID v7 offers a good compromise with time-ordered UUIDs that maintain index performance.
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