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UUID Generator

Generate universally unique identifiers (UUIDs) instantly. Support for v1, v4, v5, v7, and NIL. Free, secure, and works entirely in your browser.

Choose UUID Version

Generate UUIDs

UUID Validator

Validate and identify UUID version

Generation History

No history yet. Generate UUIDs to see them here.

Why Choose Our UUID Generator?

All UUID Versions

Generate UUID v1 (time-based), v4 (random), v5 (name-based SHA-1), v7 (Unix timestamp), and NIL UUID. Our UUID generator supports all RFC 4122 versions for maximum flexibility.

Bulk UUID Generation

Generate up to 500 UUIDs at once with our bulk UUID generator. Perfect for database seeding, testing, or generating multiple unique identifiers quickly.

Multiple Format Options

Format UUIDs as lowercase, uppercase, without hyphens, with braces, or URN format. Our GUID generator adapts to your specific formatting requirements.

UUID Validator

Built-in UUID validator checks if your UUID is valid and identifies its version. Validate UUIDs instantly to ensure RFC 4122 compliance.

Generation History

Track all generated UUIDs with automatic history. Copy, download, or delete previous generations. Perfect for managing multiple UUID generation sessions.

100% Client-Side

All UUID generation happens in your browser using cryptographically secure random number generators. Your UUIDs never leave your device, ensuring complete privacy.

How to Use the UUID Generator

Follow these simple steps to generate UUIDs for your projects

1

Step 1: Select UUID Version

Choose the UUID version that fits your needs. UUID v4 is recommended for most use cases as it generates random unique identifiers. Use UUID v1 for time-sortable IDs, v5 for deterministic generation from names, or v7 for database-optimized sortable UUIDs.

2

Step 2: Configure Options

Set the quantity for bulk UUID generation (1-500). For UUID v5, enter a namespace UUID and name string. For UUID v1, optionally specify node ID and clock sequence. Our UUID generator remembers your preferences.

3

Step 3: Choose Format

Select your preferred UUID format: lowercase (default), uppercase, no hyphens for compact storage, braces for Microsoft GUID format, or URN format for URN identifiers. The UUID generator applies formatting instantly.

4

Step 4: Generate and Use

Click 'Generate UUIDs' to create your unique identifiers. Copy individual UUIDs, copy all at once, or download as a text file. All generated UUIDs are saved in history for easy access.

Understanding UUID Versions

Choose the right UUID version for your specific use case

v1

UUID Version 1 - Time-Based

UUID v1 generates unique identifiers using the current timestamp and MAC address of the host machine. This makes v1 UUIDs sortable by creation time and traceable to the generating machine. However, UUID v1 may expose the MAC address, which could be a privacy concern in some applications.

Use Case: Best for distributed systems needing time-sortable IDs, audit logs, or when you need to track the origin of UUID generation.

Example: 550e8400-e29b-41d4-a716-446655440000

v4

UUID Version 4 - Random

UUID v4 is the most popular version, generating random unique identifiers using cryptographically secure random number generators. Each UUID v4 has 122 bits of randomness, making collisions virtually impossible. This UUID generator version is recommended for most general-purpose use cases.

Use Case: Ideal for database primary keys, session IDs, API keys, user IDs, and any scenario requiring unpredictable unique identifiers.

Example: f47ac10b-58cc-4372-a567-0e02b2c3d479

v5

UUID Version 5 - Name-Based SHA-1

UUID v5 generates deterministic UUIDs by hashing a namespace UUID and a name string using SHA-1. The same namespace and name always produce the same UUID v5, making this version perfect for creating reproducible unique identifiers from existing data.

Use Case: Perfect for generating consistent UUIDs from URLs, domain names, object identifiers, or when you need deterministic UUID generation.

Example: 886313e1-3b8a-5372-9b90-0c9aee199e5d

v7

UUID Version 7 - Unix Timestamp

UUID v7 is the newest version, combining Unix timestamps with random data. This creates database-friendly UUIDs that are both sortable and random. UUID v7 provides better database index performance than v4 while maintaining unpredictability, making it ideal for modern distributed systems.

Use Case: Best for database primary keys where sort order matters, distributed systems needing globally sortable IDs, or high-performance applications.

Example: 018e8f3e-4b2a-7890-b123-456789abcdef

nil

NIL UUID - Special Case

The NIL UUID is a special UUID where all 128 bits are set to zero (00000000-0000-0000-0000-000000000000). It's used as a placeholder or default value in applications where a UUID is required but no specific value is applicable.

Use Case: Used as default value, placeholder, or to represent 'no UUID' in database schemas and API responses.

Example: 00000000-0000-0000-0000-000000000000

Common UUID Use Cases

Database Primary Keys

Use UUID v4 or v7 as primary keys in distributed databases. UUID generator creates globally unique identifiers without coordination between servers.

API Development

Generate unique request IDs, resource identifiers, and API keys. UUID generator ensures collision-free identifiers across microservices.

Session Management

Create secure session IDs and tokens with UUID v4. Random UUIDs provide unpredictable identifiers for authentication systems.

File Storage

Generate unique filenames and object storage keys. UUID generator prevents filename collisions in distributed file systems.

Message Queues

Create unique message IDs and correlation IDs for distributed messaging systems. UUID generator ensures traceable message flows.

Distributed Systems

Generate unique identifiers across multiple nodes without coordination. UUID generator enables decentralized ID generation at scale.

Pro Tips for UUID Generation

Get the most out of our UUID generator with these expert tips

Use UUID v7 for Database Performance

UUID v7 combines timestamp ordering with randomness, providing better database index performance than UUID v4. If you're using PostgreSQL, MySQL, or other databases where sort order matters, our UUID v7 generator is the optimal choice.

Bulk Generate for Testing

Use our bulk UUID generator to create hundreds of test IDs at once. Generate 500 UUIDs, download as a file, and use them for database seeding, load testing, or mock data generation. Saves time in development workflows.

UUID v5 for Reproducible IDs

When you need the same UUID for the same input, use UUID v5. Perfect for generating consistent identifiers from URLs, email addresses, or domain names. Our UUID v5 generator ensures deterministic results every time.

Save Format Preference

Our UUID generator remembers your format preferences (uppercase, no hyphens, etc.). Set your preferred format once, and all future UUID generations will use it. No need to reconfigure each time.

Use History for Reference

All generated UUIDs are automatically saved in history. Use this feature to reference previously generated UUIDs, copy them again, or download multiple generation batches. The UUID generator keeps your entire session history.

Validate Before Using

Always validate UUIDs from external sources using our UUID validator before storing them in databases. The validator ensures RFC 4122 compliance and identifies the version, helping prevent data corruption.

Frequently Asked Questions

What is a UUID and how does a UUID generator work?
A UUID (Universally Unique Identifier) is a 128-bit identifier guaranteed to be unique across space and time. A UUID generator creates these identifiers using various algorithms: UUID v4 uses random numbers, v1 uses timestamps and MAC addresses, v5 uses hashing, and v7 uses Unix timestamps. Our UUID generator implements all versions according to RFC 4122 standards.
Which UUID version should I use?
For most applications, use UUID v4 (random) as it's unpredictable and collision-resistant. Use UUID v1 if you need time-sortable IDs and can expose MAC addresses. Choose UUID v5 for deterministic generation from names. Use UUID v7 for database-optimized sortable UUIDs in modern systems. Our UUID generator supports all versions.
What's the difference between UUID and GUID?
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially the same thing. GUID is Microsoft's implementation of the UUID standard. Our UUID generator creates identifiers compatible with both UUID and GUID formats, including Microsoft's braces format.
Are UUIDs truly unique? Can collisions happen?
UUID v4 collisions are virtually impossible with 122 bits of randomness. The probability of generating a duplicate UUID v4 is approximately 1 in 2^122 (5.3×10^36). You would need to generate billions of UUIDs per second for decades to have even a tiny chance of collision. Our UUID generator uses cryptographically secure random number generation.
Is this UUID generator secure and private?
Yes! Our UUID generator works entirely in your browser using JavaScript's crypto.getRandomValues() for cryptographically secure random number generation. No UUIDs are transmitted to any server, stored in databases, or logged. All UUID generation is 100% client-side, ensuring complete privacy.
Can I generate bulk UUIDs?
Yes! Our bulk UUID generator can create up to 500 UUIDs at once. Simply enter the desired quantity and click generate. You can copy all UUIDs to clipboard or download them as a text file. Perfect for database seeding, testing, or generating multiple unique identifiers quickly.
How do I validate a UUID?
Use our built-in UUID validator tool. Simply paste your UUID and click validate. The validator checks RFC 4122 compliance and identifies the UUID version. Valid UUIDs must follow the 8-4-4-4-12 hexadecimal format with proper version and variant bits.
What format options does this UUID generator support?
Our UUID generator supports multiple formats: lowercase (default), uppercase, no hyphens (compact), braces (Microsoft GUID), and URN format (urn:uuid:). You can switch formats instantly, and the generator remembers your preference. All formats are RFC 4122 compliant.
How do I use UUID v5 with namespace and name?
For UUID v5 generation, select v5 version, enter a namespace UUID (or use predefined namespaces like DNS or URL), and provide a name string. The UUID generator will create a deterministic UUID v5 by hashing the namespace and name with SHA-1. The same inputs always produce the same UUID v5.
Can I use these UUIDs in production databases?
Absolutely! Our UUID generator creates RFC 4122 compliant UUIDs suitable for production use. UUID v4 works great for most databases, while UUID v7 offers better index performance in databases like PostgreSQL, MySQL, and MongoDB. Many companies use UUIDs as primary keys in distributed systems.

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