Why Use This Tool?
UUID v4 is the standard unique identifier for databases, distributed systems, and APIs — 122 random bits means a collision is effectively impossible. This generator produces them from your browser's cryptographic random source, in bulk when you need seed data.
Every generated value passes the strict v4 format check: correct version nibble, correct variant bits, and the canonical 8-4-4-4-12 layout.
How It Works
- Choose how many UUIDs you need.
- Click generate — values appear one per line.
- Copy the list straight into your seed data or config.
Frequently Asked Questions
What is a UUID v4?
A 128-bit identifier in the 8-4-4-4-12 format where version 4 means the bits are random. With 122 random bits, the chance of two matching is astronomically small.
Are these UUIDs safe to use in production?
Yes — they come from your browser's cryptographic random number generator (crypto.randomUUID), the same source used for security tokens.
Why does my system want uppercase UUIDs?
Some databases and legacy systems store them uppercase. Tick the uppercase box and every value comes out capitalized.
Tips & Things to Watch
- Bulk generation is handy for test fixtures and seed data.
- UUIDs are unguessable — safe to expose in URLs, unlike sequential IDs.
- Store them as CHAR(36) or the database's native UUID type.