Use our online UUID generator tool to easily generate various versions of UUIDs (Universally Unique Identifiers). Supports version 1 (time-based), version 3 (MD5-based), version 4 (random), version 5 (SHA-1-based), and version 7 (time-ordered), with multiple format options. Whether you're a developer, system administrator, or IT professional, this tool helps you quickly generate the UUIDs you need.
UUID Generator
UUID will appear hereUUID Algorithm Information
Version 4 (Random)
Completely randomly generated. Provides best privacy and security, suitable for most applications.
- Completely random generation
- Highest security
- Suitable for most applications
- Recommended for default use
Usage Tips
Security Recommendations
- Use V1 with caution in production (may leak node information)
- V4 is usually the best choice for most applications
- Use v4 or v7 for sensitive data
- Avoid using v1 in security-critical scenarios
Usage Recommendations
- UUIDs are designed to be globally unique, even across different systems
- Prefer v4 or v7 for distributed systems
Features
Multiple Version Support
Supports generating UUIDs of versions 1, 3, 4, 5, and 7 to meet different scenario requirements
Format Options
Supports format options like uppercase and no dashes for easy integration into different systems
Batch Generation
Supports generating multiple UUIDs at once and exporting them in TXT, CSV, or JSON format
Auto Refresh
Supports auto-refresh functionality for real-time UUID generation
Secure and Reliable
Uses cryptographically secure random number generators to ensure high uniqueness of generated UUIDs
User-Friendly Interface
Intuitive user interface that's easy to use and navigate
Use Cases
Distributed Systems
Serves as unique identifiers in distributed systems, ensuring data generated by different nodes won't conflict
Database Keys
Acts as primary keys for database tables, providing globally unique record identifiers
Session Identifiers
Used for session management in web applications, ensuring unique session IDs
Transaction Identifiers
Serves as transaction IDs in financial systems, ensuring each transaction has a unique identifier
Content Addressing
Acts as content identifiers in content-addressable storage systems
Time-Based Sorting
Uses version 7 UUIDs to implement time-based sorting and ordering
Frequently Asked Questions (FAQ)
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. UUIDs are standardized by RFC 4122 and are used in many computer systems as database keys, session identifiers, and more.
Which UUID version should I use?
For most applications, UUID version 4 (random) is recommended as it provides the best balance of uniqueness and security. Use version 5 when you need deterministic UUIDs based on names, version 1 when timestamp ordering is important, version 3 for MD5-based name UUIDs, and version 7 for time-ordered UUIDs with high uniqueness.
Are UUIDs secure for sensitive applications?
UUID version 4 is generated using cryptographically secure random number generators and is suitable for most security-sensitive applications. However, version 1 may leak information about the generating system and should be used with caution in security-critical contexts. For highly sensitive applications, consider using a cryptographic random generator directly.
How do I use the UUID Generator?
Using our UUID Generator is simple: 1) Select the desired UUID version; 2) Set format options as needed (e.g., uppercase, no dashes); 3) Click the generate button; 4) Copy the generated UUID or use the export function. For batch generation, switch to batch mode and set the desired quantity.
Are my UUIDs saved?
No. Our tool is a pure client-side application, and all processing is done in your browser. Generated UUIDs are not sent to our servers or stored anywhere.
What are the differences between UUID versions?
Version 1 is based on timestamp and MAC address; version 3 is based on MD5 hash; version 4 is completely random; version 5 is based on SHA-1 hash; version 7 combines timestamp and random values. Each version has its specific uses and characteristics, and the choice depends on your application's requirements.