A UUID is a 128-bit identifier that is unique enough to generate anywhere without coordinating with a central authority. This tool produces them in bulk for keys, IDs and test data.
UUIDs solve a specific problem: generating identifiers in distributed systems without a central counter. Version 4 uses random numbers, giving 122 random bits — the probability of collision is so low that you can safely generate them anywhere without checking.
The tool generates standard RFC 4122 UUIDs, and typically offers several versions. Version 4 (random) is what almost everyone wants. Version 1 embeds a timestamp and MAC address, which is useful when sortability matters but leaks some information about when and where it was created.
Options usually include quantity, hyphenation, braces and upper case, and generation happens in your browser.
| Registration | Not required |
|---|---|
| Watermark | None |
| Cost | Free |
| Versions | v4 (random), v1 (time-based), and others |
| Bulk generation | Yes, multiple UUIDs at once |
| Formatting options | Hyphens, braces, upper case |
| Standard | RFC 4122 |
| Processing | Browser-side |
Check before you rely on it: free quotas, file limits and pricing change frequently. Confirm current terms on the official site before depending on it for regular work.
Developers needing primary keys, API request IDs, test fixtures or any identifier that must be unique without asking a server for permission.
Yes, generation is free with no registration, and UUIDs are created in your browser.
Version 4 (random) for almost everything. Version 1 embeds a timestamp and MAC address, which has privacy implications.
v4 UUIDs contain 122 random bits, making collision probability negligible in practice.
Yes, you can request a batch of UUIDs in a single click.
The specification defining UUID format and generation versions, which this tool follows.
They work well for distributed systems, but random UUIDs fragment indexes more than sequential keys. Consider the trade-off for very large tables.