A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. It is formatted as 32 hexadecimal digits displayed in five groups separated by hyphens, for example: 550e8400-e29b-41d4-a716-446655440000.

What is the difference between UUID and GUID?

UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. Both follow the same RFC 4122 specification and are interchangeable in most contexts.

Is UUID v4 truly unique?

UUID v4 is randomly generated and the probability of a collision is astronomically low — approximately 1 in 5.3×10^36. For all practical development and production purposes, UUID v4 values can be considered unique.

Can I use these UUIDs in production?

Yes. This tool uses the browser's built-in crypto.randomUUID() API (or a cryptographically secure fallback), so the generated UUIDs are suitable for use as database primary keys, session tokens, request IDs, and other production use cases.

How many UUIDs can I generate at once?

You can generate between 1 and 100 UUIDs at a time using the bulk generation feature. Use the quantity selector to choose how many you need, then click Generate to create them all instantly.

UUID Generator – Free Online UUID v4 Tool

UUID / GUID Generator

Version

Quantity

Format

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Click Generate to create UUID(s)…

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How to Use the UUID Generator

Choose a version: Select UUID v4 (Random) for cryptographically random IDs (recommended for most use cases) or UUID v1 (Time-based) for time-sortable identifiers.
Set the quantity: Enter a number from 1 to 100 to generate multiple UUIDs in one click. Useful for seeding databases or test fixtures.
Pick a format: Choose standard lowercase, uppercase, no hyphens, wrapped in braces, or URN format depending on your system requirements.
Click Generate: Hit the blue Generate button. Your UUID(s) will appear instantly in the output panel.
Copy or download: Click the copy icon next to any individual UUID, or use Copy All to grab the entire list. Download a .txt file for bulk exports.

About This UUID Generator

This free UUID generator lets you create universally unique identifiers (UUIDs) — also known as GUIDs — directly in your browser without sending any data to a server. Whether you need a single UUID or a bulk batch of up to 100, this tool has you covered.

UUID v4 is the most widely used version because it is randomly generated using a cryptographically secure random number generator (the browser's native crypto.randomUUID() API or a CSPRNG fallback). This makes it ideal for database primary keys, API tokens, session IDs, idempotency keys, and distributed system identifiers.

The tool supports multiple output formats — standard lowercase, uppercase, no-hyphen, brace-wrapped, and URN — so you can match the exact format your framework or database expects. A built-in history panel keeps track of recently generated UUIDs within your session, making it easy to retrieve a value you already generated without clicking again.

Developers, QA engineers, database administrators, and DevOps professionals will find this guid generator useful for everyday development and testing workflows.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit label standardised by RFC 4122, used to uniquely identify objects in computer systems without requiring a central authority. It is represented