About this tool
A UUID generator creates universally unique identifiers — random strings used to label records, sessions, files, or any data object without collision risk. This tool supports multiple UUID versions, so whether you need a time-based V1, a random V4, or a name-based V5, you can generate one or several at a time. It's built for developers, database architects, and anyone building applications that need reliable unique keys.
Reach for this tool when setting up primary keys in a database, creating API tokens, writing test fixtures, or any time you need a placeholder identifier that won't conflict with real data. It's also handy when seeding mock data locally or verifying your own UUID validation logic.
How to use it
- Select the UUID version you need from the version dropdown menu.
- Enter the quantity of UUIDs you want generated, up to the allowed batch limit.
- If using V5, enter your namespace and name string in the provided fields.
- Click the Generate button to produce your UUIDs instantly.
- Copy individual UUIDs with the copy icon, or use Copy All for the full list.
- Paste directly into your code, database seed file, or test suite.
Pro tips
- V4 UUIDs are random and safe for most use cases, but V5 lets you reproducibly generate the same UUID from the same input string.
- When batch generating for test data, generate more than you need upfront — re-running adds randomness that can break snapshot tests.
FAQ
Are these UUIDs truly unique?
V4 UUIDs rely on cryptographic randomness, making collisions statistically impossible in any practical application. They are not guaranteed unique in an absolute mathematical sense, but safe for production use.
Can I use these in a production database?
Yes, generated UUIDs are standard RFC 4122 compliant and work in any system that accepts UUIDs. Always use V4 for production keys unless your system specifically requires another version.
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