What is UUID Generator?
UUIDs are 128-bit identifiers used everywhere from database primary keys to session tokens. ULIDs and NanoIDs offer sortable or shorter alternatives.
How to use
- Pick a format (UUID v4, v7, ULID, NanoID).
- Choose how many to generate.
- Click Generate and copy.
Example
Use this sample to confirm what UUID Generator does before pasting your own data.
UUID v4, count 1
3f29c1d0-7b8c-4f5e-9c2a-1d4e8f6a3b21
Pick v7 for time-ordered IDs that index well in databases.
When to use it
Use UUID Generator for quick local checks, debugging, documentation prep, and one-off conversions where opening a full IDE or command-line workflow would be slower. For production-critical data, always review the output before committing or shipping it.
Frequently asked questions
What is the difference between UUID v4 and v7?
v4 is fully random. v7 has a time-ordered prefix, making it index-friendly while still being unique.
Are these IDs cryptographically random?
Yes. They use crypto.getRandomValues under the hood.
When should I use a NanoID?
When you need shorter, URL-safe IDs while keeping low collision risk.