UUID v4 Generator - Cryptographically Secure Unique ID Generation

How to Use

1. Enter the number of UUIDs to generate (1–100)
2. Set case and hyphen options
3. Click Generate to produce UUIDs
4. Copy all results to the clipboard with the copy button

Usage Examples

Database primary keys:
UUID v4 values are random with extremely low collision probability, ideal for distributed system keys.

Mock test data:
Generate multiple UUIDs at once to populate ID fields in mock data.

Hyphen-free format:
Generate 32-character strings by removing hyphens from RFC 4122 UUIDs.

FAQ

What is the collision probability of UUID v4?

The probability is 1 in 2^122, negligible in practice.

Is crypto.randomUUID() secure?

Yes. It uses the cryptographically secure random number generator (CSPRNG) from the Web Crypto API.

Is UUID v1 or v5 supported?

This tool only generates UUID v4.

Are generated UUIDs logged on a server?

No. Everything runs in the browser.

Can I get uppercase output?

Yes. Select "Uppercase" in the options.

Related Tools