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Free Online UUID v4 & GUID Generator

Generate random UUID v4 identifiers online instantly. This free UUID generator creates RFC 4122 compliant UUIDs with support for bulk generation, uppercase/lowercase, and dash-free formats. All generation runs locally in your browser.

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How to Use UUID Generator

Quick Start Guide

1

Select your UUID version (v4 random is the default and most common).

2

Choose your preferred format options: uppercase, remove dashes, or set bulk count.

3

Click "Generate" to create your UUID(s) instantly.

4

Copy individual UUIDs or use "Copy All" for bulk generation results.

Frequently Asked Questions

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It is written as 32 hexadecimal characters separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). The probability of generating duplicate UUIDs is so low it is considered impossible for practical purposes.
UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. Both are 128-bit unique identifiers following the same format. In most contexts, the terms are used interchangeably.
UUID v1 uses timestamp and MAC address (not recommended for privacy). UUID v3 uses MD5 hashing with namespace. UUID v4 uses random numbers (most popular, best for general use). UUID v5 uses SHA-1 hashing with namespace. Our generator uses UUID v4 by default as it provides the best balance of uniqueness and privacy.
Our online UUID generator supports bulk generation. You can create multiple UUIDs at once by adjusting the count in the generator settings. All UUID generation happens instantly in your browser with no data sent to any server.

Still have questions? Check out our other tools or contact us for support.

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