UUID Generator
Generate v4 UUIDs instantly in your browser. Single or bulk generation, one-click copy. No signup, no install, cryptographically random.
What is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardised as RFC 4122. Version 4 UUIDs are randomly generated, making them statistically unique across all systems and time — the probability of collision is negligible even when generating billions of identifiers. The format is eight-four-four-four-twelve hexadecimal characters separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
UUIDs are used as primary keys in databases, unique identifiers for API resources, session tokens, file names, and any context where a guaranteed-unique identifier is needed without a central authority. They're the standard choice for distributed systems where two nodes might generate IDs independently and must never collide.
All UUIDs are generated using your browser's crypto.getRandomValues() API — the same cryptographic random source used by TLS and secure storage. Nothing is sent to a server. Generate up to 10 at once and copy them individually or all at once.
How to use
Frequently asked questions
A Version 4 UUID is a randomly generated 128-bit identifier following RFC 4122. It contains 122 random bits, making collisions statistically impossible in practice.
Yes. This tool uses crypto.getRandomValues() — the browser's cryptographic random number generator — not Math.random().
Nothing is sent to any server. All generation happens locally in your browser.
v1 is based on timestamp and MAC address (potentially identifiable). v4 is purely random and the recommended default for most use cases.