What is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely label data without a central authority. This generator creates random version 4 UUIDs — the most common type — following the RFC 4122 standard. Each one looks like 3f2504e0-4f89-41d3-9a0c-0305e82c3301 and is, for all practical purposes, guaranteed to be unique.
You can generate a single UUID or hundreds at once, in lowercase or uppercase, ready to paste into databases, code or configuration.
How to Use the UUID Generator
- Enter how many UUIDs you need.
- Choose lowercase or uppercase output.
- Click Generate UUIDs.
- Copy the whole list to use in your project.
Features of Our UUID Generator
- Standards-compliant version 4 UUIDs
- Bulk generation of up to 500 at once
- Uppercase or lowercase output
- Uses secure random values
- One-click copy of the entire list
- Generated locally with complete privacy
Benefits & Use Cases
Developers use UUIDs as primary keys, correlation IDs and unique file names because they can be created independently on any machine without collisions. Bulk generation is handy for seeding databases and testing.
Since generation happens in your browser using secure randomness, the identifiers are created instantly and never exposed to any server.
The UUID Generator is completely free, needs no sign-up or installation, and runs entirely in your browser — nothing you enter is uploaded to a server, so your data stays private. It works on desktop, tablet and mobile, in light or dark mode.
Tips & Best Practices
Version 4 UUIDs are built from random values, so you can create them independently on any machine without coordination and treat each one as effectively unique. Generate in bulk when seeding a database or writing test fixtures, and choose uppercase or lowercase to match your existing data's style.
For human-facing secrets use the Password Generator instead, and to fingerprint content use the Hash Generator. Copy the list before leaving the page — nothing is stored.
FAQ about UUID Generator
What is a version 4 UUID?
A version 4 UUID is generated from random numbers, with specific bits set to mark it as v4. It is the most widely used type for general identifiers.
Are the UUIDs really unique?
The probability of a collision is astronomically small, so for practical purposes each generated UUID can be treated as globally unique.
Can I generate many at once?
Yes. You can create up to 500 UUIDs in a single click and copy the whole list, which is ideal for seeding data.
Is this secure and private?
Yes. UUIDs are built with the browser's secure random generator and never leave your device.