UUID generator
Generate a version 4 universally unique identifier.
In short
Generate a unique UUID (Universally Unique Identifier) instantly.
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as a 32-character hex string separated into five groups by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
UUIDs are designed to be globally unique across systems without requiring a central authority to coordinate assignment.
When to Use a UUID
UUIDs are used as database primary keys, session identifiers, file names, API resource identifiers, and anywhere a unique, non-sequential identifier is needed.
Because they are generated independently without a central registry, UUIDs are safe to create across distributed systems without risk of collision.
Best For
- Developers needing a quick unique identifier for testing
- Backend engineers generating resource IDs for APIs
- Database administrators seeding unique primary keys
- Anyone who needs a unique non-sequential identifier
Limitations of this tool
- One UUID is generated per request. Run the tool again to generate additional UUIDs.
Frequently asked questions
- What UUID version does this generate?
- Version 4 (UUID v4), which is randomly generated. It is the most commonly used UUID version for general-purpose identifiers.
- How unique is a UUID v4?
- UUID v4 uses 122 random bits, producing 2^122 possible values. The probability of generating a duplicate in practice is negligible.
- Are UUIDs case-sensitive?
- No. UUIDs are case-insensitive. Both lowercase and uppercase hex digits are valid and equivalent.
- Should I use a UUID or an auto-increment integer as a database ID?
- UUIDs are better for distributed systems and when you do not want to expose sequential IDs publicly. Auto-increment integers are simpler and more performant for small, centralised databases.
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Category: Utilities · Last updated 2026-11-03T04:04:53+00:00