UUID Generator
Generate random UUID v4 values instantly. Bulk generate up to 20 at once.
Between 1 and 20
About This UUID Generator
This free tool generates version 4 UUIDs (Universally Unique Identifiers) using your browser's cryptographically secure crypto.getRandomValues() API. UUID v4 values are randomly generated and are suitable for use as database primary keys, session identifiers, correlation IDs, and anywhere you need a globally unique value.
How to Use
- Enter the number of UUIDs you want to generate (1–20).
- Click the "Generate" button.
- Click "Copy" next to any individual UUID to copy it to your clipboard.
- Use the "Copy All" button to copy all generated UUIDs at once, separated by newlines.
Frequently Asked Questions
What is a UUID v4?
A UUID v4 (Universally Unique Identifier version 4) is a 128-bit identifier generated using random or pseudo-random numbers. It follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where 4 indicates the version and y is one of 8, 9, a, or b.
Are these UUIDs truly unique?
UUID v4 values are generated from 122 random bits, giving approximately 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically low. For all practical purposes, every UUID v4 generated is unique.
Is this generator secure?
Yes. This tool uses the Web Crypto API for random number generation, which provides cryptographically strong random values. All UUIDs are generated entirely in your browser and are never sent to any server.
Where are UUID v4 values commonly used?
UUID v4 values are widely used as database primary keys, API request identifiers, distributed system correlation IDs, file names, session tokens, and anywhere a globally unique identifier is needed without a centralized authority.