UUID Generator – Free Online Random UUID v4 Generator
Generate one or many cryptographically random UUIDs (version 4) in the format you need. Uses the browser's native crypto.randomUUID() API — completely offline.
How to Use
- 1
Set the count
Choose how many UUIDs to generate (1–50) using the count input.
- 2
Configure format
Toggle uppercase or remove hyphens based on your requirements.
- 3
Generate
Click Generate to create fresh UUIDs. Hover any UUID to copy it individually.
- 4
Copy all
Use the "Copy All" button to copy all UUIDs as a newline-separated list.
Frequently Asked Questions
Are these UUIDs truly random?+
Yes. This tool uses crypto.randomUUID() which is a cryptographically secure pseudo-random number generator (CSPRNG) built into modern browsers.
What is UUID v4?+
UUID version 4 is a randomly generated 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters separated by hyphens. It's the most commonly used UUID format.
Can two generated UUIDs be the same?+
Theoretically yes, but statistically impossible in practice. UUID v4 has 2^122 possible values (~5.3 undecillion), making collisions virtually impossible.
Are UUIDs suitable for database primary keys?+
Yes, UUIDs are widely used as database primary keys when you need globally unique identifiers without a central authority or sequential counter.