UUID Generator — Free UUID v4 & GUID Generator Online
DeveloperGenerate RFC 4122 UUID v4 and GUID identifiers instantly. Create 1-50 UUIDs at once, copy all with one click. Free online UUID generator — nothing sent to servers.
About the UUID Generator — Free UUID v4 & GUID Generator Online
Our free UUID generator creates RFC 4122 compliant UUID v4 identifiers in the standard 8-4-4-4-12 hexadecimal format. Generate 1 to 50 UUIDs at once. Each UUID is unique — the probability of generating a duplicate is astronomically small. Used by developers for database primary keys, API resource identifiers, session tokens, file naming and distributed system IDs.
How to Use the UUID Generator — Free UUID v4 & GUID Generator Online
- 1
Select UUID version — v4 (Random) or v1 (Time-based).
- 2
Set how many UUIDs to generate (1–50).
- 3
Click Generate.
- 4
Copy individually or click Copy All.
Frequently Asked Questions
What is a UUID?
A 128-bit identifier formatted as xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. The v4 variant is randomly generated, making it effectively unique worldwide without central coordination.
What is the difference between v4 and v1?
v4 is randomly generated. v1 is based on current timestamp and machine ID. v4 is preferred as it does not expose system information.
What is a GUID?
Microsoft's implementation of UUID — same format, used interchangeably.
Can two identical UUIDs be generated?
Practically impossible. UUID v4 has 122 random bits — 2¹²² possible values. The probability of a collision is negligible.