UUID/GUID生成器
生成唯一标识符（UUID/GUID），支持自定义格式
选择要生成的UUID版本
要生成的UUID数量（1-100）
0 UUIDs
UUID验证器
UUID/GUID Generator Documentation
UUID Versions
Version 1 (Timestamp-based)
Generated using the current timestamp and MAC address. Contains time information and can be traced back to the generating machine.
Version 4 (Random)
Generated using random or pseudo-random numbers. Most commonly used version due to simplicity and no privacy concerns.
NIL UUID
A special UUID consisting of all zeros, used to represent an empty or null UUID value.
UUID Format
A UUID is typically represented as a 36-character string in the format: 8-4-4-4-12 hexadecimal digits
- M: Indicates the UUID version (1, 4, etc.)
- N: Indicates the UUID variant (always 8, 9, a, or b)
- x: Any hexadecimal digit (0-9, a-f)
Common Use Cases
Database Primary Keys
Use UUIDs as primary keys to ensure uniqueness across distributed databases without central coordination.
Session Management
Generate unique session identifiers for web applications to track user sessions securely.
File Naming
Create unique file names for uploads to prevent conflicts and ensure file uniqueness.
Distributed Systems
Identify entities in distributed systems without requiring coordination between nodes.
Best Practices
- Use Version 4 (random) for most applications due to simplicity and privacy
- Use Version 1 only if timestamp information is required
- Store UUIDs in binary format in databases for better performance
- Validate UUID format before processing to ensure data integrity
- Consider collision probability: while extremely low, always handle duplicates gracefully
- Use lowercase format for consistency unless uppercase is specifically required