UUID Generator
Create universally unique identifiers for database keys, API resources, test data or file names. Generate one or up to 1,000 at a time, in version 4 (random) or version 7 (time-ordered).
No data needed
How to use
- Choose version 4 or 7.
- Set how many you need.
- Click Generate and copy the list.
How it works
UUID v4 contains 122 random bits from your browser's cryptographically secure generator; the chance of two ever colliding is negligible (you would need to generate about 2.7 quintillion to reach a 50% chance of one duplicate).
UUID v7, standardised in RFC 9562 (2024), starts with a 48-bit Unix timestamp in milliseconds followed by random bits. IDs created later sort after earlier ones, which keeps database indexes compact and fast.
Examples
- v4
- 3f1c1b6e-8d0a-4b8c-9f1e-2a7d4c5b6e7f — the “4” in the third group marks the version.
Common uses
- Primary keys in databases
- Idempotency keys and request IDs
- Unique file names and test fixtures
Privacy & security
This tool does not take any personal data or files. Results are generated on your device. How each tool handles files
Frequently asked questions
Should I use v4 or v7?
Use v7 for database primary keys (better index performance) and v4 when the ID must not reveal when it was created.
What is a GUID?
GUID is Microsoft's name for the same 128-bit identifier. The values are interchangeable.
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