Dev & Data ToolboxUUID / GUID Generator
UUID Version
Generation Options
Generated UUIDs
UUID Examples
UUID / GUID Generator - Professional Unique Identifier Tool
Generate cryptographically secure UUIDs (Universally Unique Identifiers) and GUIDs (Globally Unique Identifiers) for your applications. Our UUID Generator supports multiple versions including v1 (time-based), v4 (random), and v5 (name-based) with comprehensive formatting options.
All UUID generation happens in your browser using the Web Crypto API - your data never leaves your device, ensuring complete privacy and security.
How to Use the UUID Generator
- Choose UUID version - Select from v1 (time-based), v4 (random), or v5 (name-based)
- Set generation options - Choose quantity and formatting preferences
- Generate UUIDs - Click generate to create cryptographically secure UUIDs
- Copy results - Copy individual UUIDs or all results at once
UUID Versions Explained
Version 4 (Random)
Most common UUID type, generated using cryptographically secure random numbers. Each UUID is virtually guaranteed to be unique.
Version 1 (Time-based)
Generated using current timestamp and node identifier. Time-sortable and includes creation time information.
Version 5 (Name-based)
Deterministic UUID generated from namespace UUID and name using SHA-1 hash. Same input always produces same UUID.
Version 3 (Name-based MD5)
Similar to v5 but uses MD5 hash instead of SHA-1. Less secure but faster for non-security-critical applications.
Key Features
Multiple Versions
Support for v1, v3, v4, and v5 UUIDs with different use cases
Bulk Generation
Generate multiple UUIDs at once with copy-all functionality
Format Options
Customize case, hyphens, braces, and URN format
Cryptographic Security
Uses Web Crypto API for cryptographically secure random generation
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. It's designed to be unique across space and time, making it perfect for database primary keys, session identifiers, and distributed systems.
What's the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They follow the same RFC 4122 specification, so they're essentially the same thing. GUID is just Microsoft's term for UUID.
Which UUID version should I use?
Use v4 (random) for most applications - it's the most common and secure. Use v1 (time-based) when you need time-sortable IDs. Use v5 (name-based) when you need deterministic UUIDs from the same input.
Are UUIDs really unique?
While not mathematically guaranteed to be unique, the probability of collision is extremely low (about 1 in 2^122 for v4 UUIDs). For practical purposes, they can be considered unique.
Technical Information
UUID Structure
- • 8-4-4-4-12 hexadecimal format
- • 128-bit total length
- • Version bits in position 6
- • Variant bits in position 8
Implementation
- • Web Crypto API for secure randomness
- • RFC 4122 compliant
- • Client-side processing only
- • Multiple format options
Privacy & Security
100% Client-Side Processing
All UUID generation happens in your browser using the Web Crypto API. Your data never leaves your device, ensuring complete privacy and security. No data is transmitted to our servers or stored anywhere.