Developer Tool

UUID Generator

Generate random UUIDs (Universally Unique Identifiers) instantly. Choose between v1 (time-based) or v4 (random) formats. Perfect for database keys, API tokens, and session IDs.

Number of UUIDs to Generate

About UUID V4

UUID Version 4 uses random numbers to generate unique identifiers. This is the most commonly used version.

122 bits of randomness
No network information exposed
Ideal for public-facing applications
Probability of collision: nearly impossible

UUID Format: 8-4-4-4-12 hex chars

Generated UUIDs (0)

No UUIDs generated yet. Click "Generate New" to create UUIDs.

About the UUID Generator

The Neuctra Tools UUID Generator is a fast, free, and private tool for creating universally unique identifiers. Whether you need a single UUID for a database primary key or hundreds for testing, our tool generates them instantly in your browser without any server communication.

UUIDs are essential in modern software development. They enable distributed systems to generate unique IDs without coordination, prevent collisions in databases, and provide secure random tokens for authentication and authorization systems.

Common Use Cases

Database Primary Keys

Use UUIDs as primary keys instead of auto-incrementing integers for better security and distributed database support. This prevents enumeration attacks and simplifies data merging.

API Tokens & Session IDs

Generate unique session identifiers and API tokens for authentication systems. UUIDs provide cryptographically secure randomness for protecting user sessions.

Distributed Systems

In microservices architectures, multiple services can independently generate IDs without coordination. UUIDs ensure uniqueness across your entire distributed system.

File & Resource Naming

Generate unique filenames for uploaded content, preventing name collisions and making file enumeration impossible. Perfect for cloud storage and CDN systems.

How UUIDs Are Structured

A UUID is a 128-bit number displayed as 32 hexadecimal digits in five groups separated by hyphens: 8-4-4-4-12. The version number is embedded in the 13th character position (always 4 for v4, 1 for v1). The variant bits in the 17th position indicate the UUID layout variant.

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

Green: Version number (4 = UUID v4, 1 = UUID v1) • Orange: Variant bits

UUID stands for Universally Unique Identifier. It's a 128-bit number used to uniquely identify information in computer systems. The standard format is 8-4-4-4-12 hexadecimal digits (e.g., 550e8400-e29b-41d4-a716-446655440000).

UUID v1 is time-based, generated using the current timestamp and the MAC address of your network card. UUID v4 is purely random, using random or pseudo-random numbers. v4 is more commonly used due to privacy concerns with v1 revealing network information.

UUIDs are designed to be unique across space and time. The probability of generating a duplicate UUID v4 is extremely low (1 in 2^122). You'd need to generate 1 billion UUIDs per second for about 100 years to have a 50% chance of a single collision.

UUIDs are ideal for distributed systems, database primary keys, file identifiers, session IDs, and any scenario where you need unique identifiers across multiple systems without centralized coordination. They're particularly useful in microservices architectures and cloud-native applications.