UUID Generator
Generate random UUID v4 identifiers — single or in bulk.
How to use
- 1
Pick how many UUIDs you need (1–20).
- 2
Click Generate to create them instantly.
- 3
Copy a single value or use Copy All.
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Free UUID v4 Generator — Online Tool
Generate cryptographically random UUID version 4 identifiers in your browser. Useful for database keys, API tokens, file names, and any case where you need a guaranteed unique identifier.
A UUID (Universally Unique Identifier) is a 128-bit value commonly written as 36 hexadecimal characters with hyphens. Version 4 UUIDs are generated from random data, making collisions practically impossible.
This tool uses the Web Crypto API (crypto.randomUUID) for true cryptographic randomness, with a getRandomValues fallback for older browsers. Nothing is transmitted — generation happens locally.
Frequently Asked Questions
What is a UUID v4?
A 128-bit identifier generated from random data, formatted as 8-4-4-4-12 hex characters.
Are these truly unique?
Collisions are astronomically unlikely — UUID v4 is safe to use as a primary key.
How many can I generate at once?
Up to 20 UUIDs per click.
Is it secure?
Yes — generation uses the browser's cryptographically secure random source.