UUID Generator

A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used as unique keys in databases, session tokens, API identifiers, file names, and distributed systems where IDs must not collide across machines.

Click the Generate button and a new UUID v4 is created instantly. Click Copy to add it to your clipboard. You can also set a quantity (1–100) to generate multiple UUIDs at once. All generated UUIDs are immediately ready to use in your code or database.

UUID v4 uses cryptographically secure random data — it has no meaningful structure and is purely random. UUID v1 is time-based (encodes MAC address and timestamp). UUID v3 and v5 are name-based using hashing. v4 is the most commonly used version for general-purpose unique ID generation.

UUID v4 has 122 bits of randomness, producing approximately 5.3 undecillion (5.3 × 10^36) possible values. The probability of generating two identical UUIDs is astronomically small — you would need to generate billions of UUIDs per second for millions of years before a collision becomes statistically likely.

Yes. Set the quantity field to any number from 1 to 100 and click Generate to create that many unique UUIDs in one operation. You can copy all of them at once or download them as a text file. Each UUID in the batch is independently random.

Yes. GUID (Globally Unique Identifier) is Microsoft's term for the same concept as UUID. They follow the same RFC 4122 standard and format. GUIDs are commonly used in .NET and Windows environments; UUIDs are the universal term used across all platforms and languages.

Yes. UUID v4 is widely used as a primary key type in PostgreSQL, MySQL, MongoDB, Firebase, and other databases. They allow record creation without a centralized ID sequence, making them ideal for distributed systems, offline-first apps, and microservices architectures.

No. UUID generation uses your browser's `crypto.randomUUID()` or `crypto.getRandomValues()` API and runs entirely in JavaScript locally. No generated UUIDs are ever transmitted to a server, stored, or logged in any way.

Yes. Open the UUID Generator in any mobile browser on iPhone or Android. Tap Generate and tap Copy to use the UUID in your mobile app or email. The tool works the same on any device with a modern browser.

Yes, 100% free. No sign-up, no rate limits, no API keys required. Generate as many UUIDs as you need at any time, instantly in your browser.