UUID Generator & Validator
Generate universally unique identifiers (UUIDs) in multiple versions and formats. Validate existing UUIDs and decode their information.
Options
Randomly generated (most common)
Generated UUIDs
No UUIDs generated yet. Click "Generate UUID" to create some!
Multiple Versions
Generate v1 (timestamp), v4 (random), and v5 (namespace) UUIDs
Bulk Generation
Create up to 100 UUIDs at once for your applications
Multiple Formats
Standard, uppercase, no hyphens, braces, or URN format
Validation
Validate and decode UUID version, variant, and structure
Common Use Cases
Database Records
Use UUIDs as primary keys in distributed databases to avoid collisions
API Development
Generate unique request IDs for tracking and debugging API calls
File Naming
Create unique filenames for uploads and temporary files
Session Management
Generate secure session tokens and authentication identifiers
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The probability of generating duplicate UUIDs is so low that they can be considered unique for practical purposes.
Which UUID version should I use?
- Version 4 (Random): Most common, good for general use
- Version 1 (Timestamp): When you need time-based ordering
- Version 5 (SHA-1): When you need deterministic UUIDs from a namespace and name
Are UUIDs really unique?
While not mathematically guaranteed to be unique, the probability of generating duplicate UUIDs is extremely small. For UUID v4, you'd need to generate about 2.71 quintillion UUIDs before having a 50% chance of collision.
Can I extract information from a UUID?
Yes, for some versions. Version 1 UUIDs contain timestamp and MAC address information. Version 3 and 5 UUIDs are derived from namespace and name. Version 4 UUIDs are random and contain no extractable information beyond the version and variant.