What this tool is good for
UUID is a 128-bit identifier commonly used for database keys, order IDs, request tracing, and distributed system resources. This page can generate UUID v1 and UUID v4 in batches and lets you copy the results immediately.
If you only need a practical random identifier, UUID v4 is usually the default choice.
Typical use cases
- Generate unique IDs for new records, API requests, or job instances.
- Prepare bulk identifiers for test data, imports, or load testing.
- Attach a tracing ID to a request or message chain in logs.
How to use it
- Choose the version you want, with v4 being the recommended default.
- Set how many values to generate.
- Enable uppercase if a downstream system requires that format.
- Refresh the list and copy the generated output.
Example output
550e8400-e29b-41d4-a716-446655440000
9c858901-8a57-4791-81fe-4c455b099bc9
Actual values are different each time; the sample above only shows the expected shape.
Common mistakes
- UUIDs are designed for uniqueness, not as secure tokens or cryptographic secrets.
- Check whether downstream systems are case-sensitive before switching to uppercase output.
- Choose v1 only when you clearly need timestamp-related characteristics or legacy compatibility.
FAQ
How should I choose between UUID v1 and v4?
For most business scenarios, v4 is enough because it is random, easy to use, and does not expose timing characteristics. Consider v1 only when you specifically need time-related behavior or legacy compatibility.
Is GUID different from UUID?
GUID is usually Microsoft terminology for UUID. In most practical cases they are treated as the same kind of 128-bit unique identifier.
Can batch-generated UUIDs collide?
Any identifier has a theoretical collision probability, but the UUID space is extremely large. In normal application workloads, collisions are very unlikely, though business-level uniqueness constraints should still be enforced.
Can I use UUIDs as passwords or keys?
That is not recommended. UUIDs are great as unique identifiers, but not as passwords, access tokens, or encryption keys. Use a dedicated random credential generator for security-sensitive values.
Related tools
If you want a sortable identifier or a stronger random credential instead, these tools are a good next step:
- ULID Generator：Generate ULIDs as an alternative to UUIDs
- Random Password Generator：Generate random passwords, tokens, and strings