Online UUID Generator
v1.0.0Instantly generate UUID v1, v3, v4, v5, v6, and v7 values online with our browser-based UUID Generator. Useful for APIs, databases, distributed systems, tests, and fixtures.
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UUID Generator
Use this UUID Generator to create UUID v1, v3, v4, v5, v6, and v7 values directly in your browser. It is useful when you need globally unique identifiers for APIs, databases, distributed systems, tests, fixtures, or public resource references.
The tool is fast, private, and convenient for both one-off generation and larger development workflows.
What Is a UUID?
A UUID, or Universally Unique Identifier, is a 128-bit identifier typically displayed as a 36-character string with hyphens.
Example:
f47ac10b-58cc-4372-a567-0e02b2c3d479
Different UUID versions serve different needs:
- v1 uses time and node information
- v3 and v5 derive deterministic UUIDs from a namespace and name
- v4 uses random data
- v6 and v7 are newer time-ordered formats that are more suitable for sorting
UUID Version Comparison
| Version | How it works | Best for | Notes |
|---|---|---|---|
| v1 | Time-based with node information | Legacy systems and compatibility scenarios | Can expose timing and host-related metadata |
| v3 | Hashes a namespace and name with MD5 | Stable IDs from the same input | Deterministic output, same input gives the same UUID |
| v4 | Fully random | General-purpose unique IDs | Usually the simplest default choice |
| v5 | Hashes a namespace and name with SHA-1 | Stable IDs from the same input | Deterministic like v3, but based on SHA-1 |
| v6 | Reordered time-based UUID | Systems that benefit from sortable UUIDs | Easier to index and sort than v1 |
| v7 | Unix time plus randomness | Modern sortable UUID use cases | Good balance between uniqueness and time ordering |
Why Developers Use UUIDs
UUIDs are common because they:
- avoid simple sequential patterns
- work well across distributed systems
- reduce the need for centralized ID coordination
- are widely supported in databases and programming languages
Common Use Cases
- API resource identifiers
- database primary keys
- queue messages and event records
- fixture data for tests
- public-facing IDs where sequential values would be undesirable
Notes for Developers
- UUIDs are great when uniqueness matters more than sort order
- If you need lexicographic or time-based ordering, ULIDs or Snowflake-style IDs may be a better fit
- UUID v4 is usually the simplest general-purpose choice
- UUID v7 is a good option when you want a modern UUID that is easier to sort by time
Frequently Asked Questions
Are UUIDs unique?
They are designed to be globally unique with an extremely low collision probability.
Are UUIDs sortable?
UUID v4 values are not naturally time-sortable. If ordering matters, UUID v6, UUID v7, ULIDs, or another ordered ID format may be a better fit.
When should I choose UUIDs?
Choose them when you want widely supported unique identifiers without exposing sequential patterns.
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Final Thoughts
UUIDs are one of the most common identifier formats in modern software. This generator makes it easy to create them on demand for testing, development, and integration work without leaving the browser.
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