UUID Generator – Generate UUID v4 Online (Bulk Supported)

How to Use the UUID Generator

1. Set the quantity of UUIDs you need (1 to 100).
2. Choose a format — standard with hyphens, no hyphens, with braces, or with parentheses.
3. Pick lowercase or uppercase output.
4. Click Generate UUID(s) — your identifiers appear instantly.
5. Click Copy All to copy every UUID to your clipboard at once.

What Is a UUID?

A UUID (Universally Unique Identifier), also called a GUID (Globally Unique Identifier) in Microsoft systems, is a 128-bit value used to uniquely identify information across systems without requiring a central authority. Our generator creates UUID version 4 identifiers — random 128-bit values where 122 bits are randomly generated and 6 bits encode the version (4) and variant. The result is so statistically unique that you can generate billions of them without any practical risk of collision.

Common Uses for UUIDs

• Database primary keys — use UUIDs instead of auto-incrementing integers to avoid conflicts in distributed systems.
• API request IDs — tag each request with a unique ID for tracing and debugging.
• Session tokens — generate unguessable identifiers for user sessions.
• File and asset naming — prevent filename collisions in cloud storage.
• Distributed systems — generate IDs across multiple servers without coordination.
• Software development — component IDs in React, Vue, or other frameworks.
• Testing — create unique sample data for fixtures and seed files.

Why Choose Our UUID Generator

• Cryptographically secure — uses the browser's crypto.getRandomValues() API, not weak Math.random().
• Privacy-first — 100% browser-based. UUIDs are generated locally and never sent to any server.
• Bulk generation — create up to 100 UUIDs in a single click.
• Multiple formats — standard, compact, braces, parentheses; lowercase or uppercase.
• RFC 4122 compliant — version 4 UUIDs that match the official specification.
• No signup, no tracking, no ads in your data.

Frequently Asked Questions

What's the difference between UUID v1 and v4?

UUID v1 is generated from the current timestamp and the machine's MAC address — it's predictable and can leak information about when and where it was created. UUID v4 is fully random and reveals nothing about its origin. For most use cases — database keys, API tokens, file names — UUID v4 is the recommended choice.

How unique are UUID v4 identifiers?

A UUID v4 has 122 bits of randomness, giving roughly 5.3 × 10^36 possible values. To have a 50% chance of any collision, you'd need to generate about 2.71 quintillion UUIDs. For all practical purposes, they're unique.

Can I use these UUIDs in production?

Yes. Our generator uses crypto.getRandomValues(), the same cryptographically secure random source used by web security APIs. The output is RFC 4122 compliant and suitable for production databases, APIs, and security tokens.

Are UUID and GUID the same thing?

Functionally, yes. UUID is the standard term (defined by RFC 4122); GUID is Microsoft's name for the same concept. They use the same format and are interchangeable.

Does the generator work offline?

Yes. Once the page is loaded, UUID generation runs entirely in your browser — no internet connection or server required.