UUID Generator is a free tool for instantly creating a valid UUID whenever your software project needs a unique ID. UUIDs used for database records, API keys, test data, or file naming are generated using your browser's own cryptographically secure random number generator. Beyond the classic random-based v4, it also supports v1 (which embeds a timestamp) and v7, the version increasingly preferred for database primary keys because it sorts sequentially. Generate one UUID or several at once, and copy results individually or as a full list.
How to Use It
- Pick a UUID version (v1, v4, or v7).
- Choose how many UUIDs you want.
- Click 'Generate'.
- See the generated UUIDs.
- Copy a single UUID or the whole list.
Use Cases
- Generating unique IDs for database records
- Creating test data for an API
- Ensuring uniqueness in file or session naming
- Placeholder IDs for mock or test data sets
Frequently Asked Questions
Are the generated UUIDs really unique?
Yes, regardless of which version you pick; the odds of a collision are negligible in practice.
What's the difference between v1, v4, and v7?
v4 is fully random. v1 embeds the creation time, so it's possible to tell roughly when it was generated. v7 also embeds a timestamp, but unlike v1 it sorts sequentially, which makes it faster to index in a database.
How many UUIDs can I generate at once?
You can generate and list anywhere from 1 to 50 UUIDs at a time.
Are the UUIDs stored anywhere?
No, generated values are only shown in your browser and are never sent to a server.