UUID Generator Online Free

UUID v1 is generated using the current timestamp and the machine's MAC address, which means it encodes information about when and where it was created. UUID v4 is purely random — it contains no such information, making it safer to use in public-facing systems where leaking machine identity is a concern. For most use cases, v4 is preferred.

Technically yes, but the probability is astronomically low. There are 2¹²² possible v4 UUIDs. You would need to generate about 2.7 quintillion UUIDs before a 50% chance of even one collision. In practice, UUIDs are treated as globally unique.

UUIDs are used as primary keys in databases, session tokens, file names for uploaded files, tracking IDs in distributed systems, correlation IDs in API logs, and anywhere a unique identifier is needed without a central authority to assign it.

Yes. This tool uses the browser's built-in crypto.randomUUID() API (or crypto.getRandomValues() as fallback), which uses a cryptographically secure pseudo-random number generator (CSPRNG). No UUIDs are sent to any server — everything runs locally in your browser.