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Free UUID/GUID Generator — Generate Unique Identifiers
Generate random UUID v4 identifiers. RFC 4122 compliant.
About UUID Generator
Generate universally unique identifiers (UUIDs) compliant with RFC 4122 version 4. Click to generate one, or generate a batch of up to 100 at once and copy them individually or as a formatted list. UUIDs are the standard for unique IDs in databases (as primary keys), distributed systems, API request tracking, session tokens, and anywhere you need a collision-resistant identifier without a central authority.
How to Use UUID Generator
- 1Click Generate to create a single UUID v4
- 2Generate multiple UUIDs at once with the batch option
- 3Copy individual UUIDs or download the full list
- 4Choose from uppercase, lowercase, or hyphenated formats
When to Use UUID Generator
- ▸Creating unique database primary keys
- ▸Generating IDs for distributed systems and microservices
- ▸Naming uploaded files without collisions
- ▸Tagging log entries and tracing requests across services
Frequently Asked Questions
- Are UUIDs guaranteed to be unique?
- UUID v4 generates 122 random bits, giving 5.3 × 10^36 possible values. The probability of collision is so astronomically low that they're considered unique in practice for all but the most extreme scenarios.
- What's the difference between UUID v1 and v4?
- UUID v1 is time-based and includes the MAC address (less privacy-preserving). UUID v4 is purely random — our generator uses v4 for maximum privacy and unpredictability.