Free UUID v4 Generator
Generate random version 4 UUIDs in bulk. Copy one ID or the whole list, in lowercase, uppercase or without hyphens.
- Free, no signup
- Up to 100 at once
- Generated on your device
How to use UUID Generator
- Choose how many UUIDs you need (1–100).
- Click Generate, and pick uppercase or no hyphens if your system needs it.
- Copy a single UUID with its Copy button, or copy the whole list.
Features
- Random v4 UUIDs from the browser secure random source
- Generate up to 100 at a time
- Uppercase and no-hyphen formats
- Copy individual IDs or the entire list
- Runs locally — nothing is sent or stored
What can you use UUID Generator for?
A UUID is a 128-bit identifier that is virtually guaranteed to be unique, commonly used as a database key, session ID or file name. Generate one or a whole batch instantly, then copy them individually or all at once.
A UUID (universally unique identifier) is a 128-bit value generated with enough randomness that the odds of two ever colliding are effectively zero, even across billions of records. That makes it a reliable choice for database primary keys, session tokens and file names when you need a unique ID without coordinating with a central counter.
- Generating a primary key for a new database record during development or testing.
- Creating a unique session ID, request ID or tracking token for an application.
- Producing test data with realistic-looking unique identifiers.
- Naming uploaded files uniquely to avoid collisions between users.
Tips for better results
- Generate a batch at once if you need several IDs for seed or test data, rather than one at a time.
- A v4 UUID (what this tool generates) is random-based, which is the right choice for most general-purpose IDs — it doesn't encode a timestamp.
- Store UUIDs as their native database type where available rather than plain text, for smaller storage and faster indexing.
Frequently asked questions
Is the UUID generator free?
Yes, generating UUIDs is completely free with no limits.
What type of UUID does this generate?
It generates random version 4 UUIDs, suitable for most identifier needs.
Can I generate more than one UUID at once?
Yes, choose how many you need and copy them individually or all at once.
Can two generated UUIDs ever be the same?
It's mathematically possible but practically negligible — with 122 random bits, you'd need to generate trillions of UUIDs before a collision became a realistic concern.
What's the difference between a UUID and a GUID?
They're effectively the same concept — GUID is Microsoft's name for the same standard 128-bit identifier format.
Are UUIDs really unique?
For practical purposes, yes. A v4 UUID has 122 random bits, so you would need to generate billions per second for decades before a collision became likely.
Is a UUID the same as a GUID?
Yes. GUID (globally unique identifier) is the term Microsoft uses for the same 128-bit format.