UUID Generator — Create Random UUID v4 Online

UUIDs (Universally Unique Identifiers) are the standard way to assign IDs without a central coordinator. Database primary keys, API resource IDs, correlation IDs in logs, message queue keys — UUID v4 shows up everywhere.

What is a UUID v4?

A UUID is 128 bits, usually shown as 36 characters:

550e8400-e29b-41d4-a716-446655440000

Version 4 means the value is random (122 random bits). Collision probability is negligible for practical systems — you'd need billions of IDs before odds matter.

Microsoft ecosystems call the same thing a GUID (Globally Unique Identifier).

When to use UUIDs

• Database primary keys — avoid auto-increment leaks and shard-friendly IDs
• Distributed systems — generate IDs on any node without coordination
• API resource identifiers — /users/550e8400-e29b-41d4-a716-446655440000
• Log correlation — trace a request across microservices
• Test data — seed fixtures with realistic IDs

Generate UUIDs in your browser

The VyomaStack UUID Generator uses crypto.randomUUID() — cryptographically secure, same API Node.js 19+ and modern browsers expose.

1. Click Generate for a single UUID 2. Set count (1–100) for bulk generation 3. Copy one UUID or Copy All as a list 4. Nothing is sent to a server

UUID versions (quick reference)

For most apps today, v4 is the right default. Use v7 if you need time-sortable IDs in new systems.

UUID vs auto-increment

UUIDs trade storage and index locality for independence and privacy.

Bulk UUID generation

Need 50 test user IDs for a seed script? Set count to 50, generate, copy all. Faster than a loop in the terminal when you're not already in a REPL.

Related tools

• JWT Decoder — jti claim is often a UUID
• Hash Generator — fingerprint content (different from random IDs)
• Password Generator — secrets, not identifiers

Try it now

Generate UUID v4 instantly — free, private, no signup.