UUID Generator
Generate UUIDs
What Is This Tool?
The UUID Generator creates random version 4 UUIDs (Universally Unique Identifiers) — 128-bit values conventionally written as 32 hex digits split into five groups. It uses your browser's cryptographically secure random number generator, so generated values are suitable for database keys, request IDs, and session tokens.
How to Use
Set how many UUIDs you need (1 to 100).
Click Generate.
Copy an individual UUID, or use Copy All for the whole list.
Use Download to save the list as a text file.
Features
- Generate 1 to 100 UUIDs at once
- Cryptographically secure randomness (crypto.getRandomValues)
- Standard RFC 4122 version 4 format
- Per-line copy button plus Copy All
- Download the list as a .txt file
- 100% client-side — nothing leaves your browser
Examples
3f29c9de-1a2b-4c3d-8e5f-6789abcdef01
a1b2c3d4-e5f6-47a8-9b0c-1d2e3f4a5b6c
Common Use Cases
- Generating primary keys for a database table
- Creating unique request or trace IDs for logging
- Generating test fixture data
- Creating unique session or API key identifiers
Frequently Asked Questions
What is a UUID v4?
A UUID (Universally Unique Identifier) version 4 is a 128-bit identifier generated from random bits, formatted as 32 hex digits in five dash-separated groups. The odds of two generated values colliding are astronomically small.
Is the randomness secure?
Yes. This tool uses crypto.randomUUID() where available, or crypto.getRandomValues() as a fallback — both are cryptographically secure, unlike Math.random().
How many UUIDs can I generate at once?
Up to 100 per click. Click Generate again for more.
Are these UUIDs guaranteed unique?
Not mathematically guaranteed, but the collision probability for random UUID v4 values is so low it's considered negligible in practice.
Can I download the list?
Yes, click Download to save all generated UUIDs as a plain text file, one per line.