How to Generate a UUID Online for Free

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A UUID (universally unique identifier) is a 128-bit value designed so that generating one anywhere, at any time, has a vanishingly small chance of colliding with another. That makes it a safe default for database record IDs, API keys, session tokens, and anywhere else you need a unique value without coordinating with a central counter.

When you need a UUID

• Assigning a unique ID to a new database record
• Generating a temporary identifier for a session, request, or object
• Creating a placeholder key for testing an API or data structure
• Naming a file or resource where a guaranteed-unique name matters

How to generate a UUID, step by step

1. Open the UUID Generator.
2. A random UUID is generated instantly.
3. Copy it, or generate another if you need more than one.

Tips for working with UUIDs

• UUIDs are unique, not sequential. Don't expect them to sort in creation order — if you need that, look at a sortable ID scheme designed for it instead.
• Use a fresh UUID per record, not a reused or hardcoded one, to get the collision-resistance benefit that makes them useful in the first place.
• UUIDs are safe to expose publicly in most cases, since they don't reveal sequence or count information the way an incrementing ID might.

Common questions

Can two generated UUIDs ever collide? It's technically possible but astronomically unlikely with standard UUID generation — collisions aren't a practical concern for virtually any real-world use case.

What format does the UUID come in? The standard UUID format: 32 hexadecimal characters grouped into five sections separated by hyphens.

Can I generate more than one at a time? Generate as many as you need, one at a time, copying each as you go.

Need a unique identifier right now? Generate a UUID for free →