UUID Generator
Generate random v4 UUIDs in bulk, one click to copy.
Runs entirely in your browser — your data never leaves this page.
About the UUID Generator
This UUID generator creates cryptographically random version 4 UUIDs (universally unique identifiers) using the browser’s built-in Web Crypto API. A UUID is a 128-bit value, usually written as 36 characters, that is practically guaranteed to be unique — perfect for database primary keys, request IDs, and distributed systems where you cannot rely on a central counter.
Generate one or many at once, switch to uppercase, and copy individual values or the whole batch with a single click.
How to use it
- 1Set how many UUIDs you want to generate (1–100).
- 2Toggle Uppercase if your system expects capital letters.
- 3Click Regenerate for a fresh batch at any time.
- 4Copy a single UUID, or use Copy all to grab the entire list.
Common use cases
- Generating database primary keys
- Creating unique request or correlation IDs
- Seeding test data and fixtures
- Naming resources in distributed systems
Frequently asked questions
What version of UUID does this generate?
It generates version 4 (v4) UUIDs, which are based on random numbers. They are created with crypto.randomUUID(), the browser’s cryptographically secure random generator.
Are these UUIDs truly unique?
Version 4 UUIDs have 122 random bits, giving roughly 5.3 × 10³⁶ possible values. The chance of generating a duplicate is so small that they are treated as unique for all practical purposes.
Are the UUIDs generated on my device?
Yes. They are created locally in your browser and never sent anywhere, so they are safe to use even for private systems.