Best for
- Database migrations
- Generating dummy IDs for tests
- Software testing
Privacy
UUIDs are generated client-side using the Web Crypto API, ensuring absolute privacy.
Quick tips
- UUID v7 is highly recommended for database primary keys because it is time-ordered and prevents index fragmentation.
- You can generate up to 100,000 UUIDs and download them directly as a file without crashing the browser.
How to use this tool
- Select the UUID version you need (v4 for random, v7 for databases).
- Set the amount up to 100,000.
- Toggle formatting options like hyphens or uppercase.
- Copy the identifiers or download them as a .txt file if generating in bulk.
Common questions
What is the difference between UUID v4 and v7?
UUID v4 is completely random. UUID v7 combines a timestamp with random data, meaning newer UUIDs will sort after older ones. This makes v7 much faster and more efficient for database indexing.
Are these UUIDs guaranteed unique?
Yes. The random portions are generated using secure cryptographic APIs. The chance of a collision is practically zero.