How do I use the UUID generator?
- Choose v4 (random) or v7 (time-ordered).
- Set how many you need, up to 500.
- Press Generate UUIDs and copy the list.
UUID generator: frequently asked questions
Should I use UUID v4 or v7?
Use v7 for database keys, because new rows sort together and indexes stay fast. Use v4 when the ID should reveal nothing, not even creation time.
Can two UUIDs ever be the same?
In practice no. A v4 UUID has 122 random bits, so a collision is astronomically unlikely.
What is a UUID?
A 128-bit identifier written as 36 characters, designed to be unique without a central database.
Which UUID version should I use?
Version 4 (random) is the general default. Version 7 is time-ordered, which suits database primary keys.
Are UUIDs secure tokens?
Random v4 UUIDs are hard to guess, but use dedicated tokens for password resets and API keys.
Are UUIDs good database keys?
Yes, especially v7, which keeps indexes efficient because values increase over time.
Can I generate UUIDs in bulk?
Yes. Choose how many you need and copy them all at once.
Are UUIDs case-sensitive?
No. Lowercase is the conventional format.
How are these UUIDs generated?
With your browser’s cryptographically secure random number generator.
Is there an API for this tool?
Selected tools are available through a rate-limited public API. Contact us if you need higher volumes.