UUID Generator

Generate random UUIDs (Universally Unique Identifiers) in various formats.

UUID Generator

UUID Version

V4: Random (recommended) | V7: Time-ordered (new standard) | V1: Legacy time-based | V3: MD5 namespace | V5: SHA-1 namespace

Number of UUIDs

Output Format

Click "Generate UUIDs" to create unique identifiers

How It Works

1

Choose UUID Version

Select Version 4 (random) for most use cases - recommended for databases, session IDs, and tracking. Or choose Version 1 (time-based) for time-ordered unique identifiers.

2

Set Quantity

Generate 1 to 100 UUIDs at once. Perfect for bulk operations, testing, or when you need multiple unique identifiers.

3

Select Format

Choose from standard format (with hyphens), no hyphens, uppercase, or with braces. Copy individual UUIDs or copy all at once with one click.

Generate random UUIDs (Universally Unique Identifiers) in various formats.

This UUID Generator creates unique identifiers instantly with multiple format options. Generate Version 4 (random) or Version 1 (time-based) UUIDs, create up to 100 at once. Choose from standard format, no hyphens, uppercase, or with braces. Perfect for developers, database administrators, and anyone needing unique identifiers for their applications.

All processing happens directly in your browser, ensuring your data remains private and secure. Our tool works on all devices - desktop, tablet, and mobile.

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Frequently Asked Questions

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems. Also known as GUID (Globally Unique Identifier), UUIDs provide an extremely high probability of being unique across space and time. They're commonly used as database primary keys, session identifiers, transaction IDs, and for tracking objects in distributed systems.

What is the difference between UUID v1 and v4?

UUID Version 1 (v1) is time-based and includes the current timestamp and node identifier (MAC address). This makes them time-ordered and unique across space. UUID Version 4 (v4) is completely random and provides the best randomness. For most use cases, v4 is recommended because it doesn't reveal any information about when/where it was created and provides excellent uniqueness.

How unique are UUIDs? Can they collide?

UUID v4 has 2^122 possible values (about 5.3 undecillion). The probability of generating a duplicate is astronomically low - you'd need to generate billions of UUIDs per second for many years to have a reasonable chance of collision. For practical purposes, UUIDs are considered unique. However, if using v1, the node identifier portion could theoretically be duplicated if generated at the exact same microsecond on the same machine.

When should I use UUIDs vs. auto-increment IDs?

UUIDs are better for distributed systems, public-facing identifiers (to prevent enumeration attacks), and when you need to generate IDs without coordination. Auto-increment IDs are better for database performance (smaller, indexed, faster). Many systems use both: auto-increment internally for performance, UUIDs externally for security. UUIDs are also ideal for microservices and systems that merge data from multiple sources.

What format options are available?

Standard format includes hyphens (8-4-4-4-12 pattern): 550e8400-e29b-41d4-a716-446655440000. No hyphens removes all dashes for compact storage. Uppercase converts all letters to uppercase for consistency. With braces adds curly braces {uuid} which some APIs require. All formats represent the same 128-bit value.

About UUID Generator

UUID Generator is an essential developer tool for creating Universally Unique Identifiers (UUIDs), also known as GUIDs (Globally Unique Identifiers). UUIDs are 128-bit identifiers that provide an extremely high probability of being unique across space and time, making them perfect for database primary keys, session identifiers, transaction IDs, and tracking objects in distributed systems. Version 4 UUIDs are generated using cryptographically secure random numbers, providing excellent randomness without revealing any information about when or where they were created. Version 1 UUIDs are time-based and include timestamp and node identifier, making them time-ordered and suitable for applications that require chronological ordering. Our generator supports multiple formats including standard (with hyphens), no hyphens for compact storage, uppercase for consistency, and with braces for API compatibility. Generate up to 100 UUIDs at once with bulk generation, perfect for testing and development. Whether you're a software developer building distributed systems, a database administrator designing schemas, a backend engineer implementing microservices, a full-stack developer working on REST APIs, a QA engineer generating test data, or a student learning about unique identifiers and distributed systems design, this tool provides instant UUID generation with flexible formatting options. Perfect for developers who need reliable unique identifiers without managing complex UUID libraries or ensuring randomness quality. Understand the differences between UUID versions, choose the right format for your use case, and generate identifiers with confidence.

Unlike many online tools that require account creation or have hidden costs, UUID Generator is completely free and requires no signup. Simply open the tool and start using it immediately. Your privacy is our priority - all processing happens locally in your browser, and your data is never stored on our servers.

Whether you're a professional, student, or casual user, UUID Generator is designed to be intuitive and efficient. Our tool works seamlessly on desktop computers, tablets, and mobile devices, ensuring you can get your tasks done wherever you are.