UUID Generator
Generate random UUID v4 identifiers instantly.
What Is This Tool?
Our UUID generator creates random version 4 UUIDs (Universally Unique Identifiers) instantly in your browser. UUIDs are 128-bit identifiers used in software development to uniquely identify records, sessions, and transactions without requiring a central authority. Generate one at a time or in bulk, and copy them with a single click.
How to Use
- Click Generate to create a single UUID v4.
- To generate multiple UUIDs, enter the quantity and click Bulk Generate.
- Click the copy icon next to any UUID to copy it to your clipboard.
- Use Copy All to copy the entire list at once.
Common Use Cases
- Generating primary keys for database records
- Creating unique session tokens or request IDs in APIs
- Identifying resources in distributed systems without coordination
- Producing test data for development and QA environments
Tips & Tricks
- UUID v4 uses random bits — the probability of collision is astronomically low for practical use.
- UUIDs are case-insensitive; store them in lowercase for consistency.
- If you need sequential IDs with uniqueness, consider UUID v7 (time-ordered) instead.
Frequently Asked Questions
What's the difference between UUID v4 and other UUID versions?
UUID v4 is generated from random or pseudo-random bits, while other versions (v1, v7) incorporate a timestamp or MAC address. v4 is the most common choice when you just need a unique, unpredictable identifier.
How likely is it that two generated UUIDs collide?
With 122 random bits, the odds of a collision are astronomically small — you'd need to generate billions of UUIDs per second for centuries before a collision became statistically likely.
Can I generate more than one UUID at a time?
Yes. Enter the quantity you need and click Bulk Generate to produce a list, then use Copy All to copy every UUID at once.
Are generated UUIDs guaranteed to be unique across different users of this tool?
They're not centrally coordinated, but the randomness is strong enough that collisions between independently generated UUIDs are effectively impossible in practice.
Is anything sent to a server when I generate a UUID?
No. UUIDs are generated entirely client-side using your browser's random number generator — nothing is transmitted or logged.
Generate random UUID v4 identifiers instantly with our free online UUID generator. Create single or bulk UUIDs for databases, APIs, and software development.
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