Online UUID Generator (All Versions v1-v7)
Instantly generate RFC-compliant UUIDs with customizable format, bulk export, and zero server logs. All UUID versions (v1–v7) supported with advanced features for developers.
Format Options
Generated UUIDs
What is UUID?
UUID generation example
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by RFC 4122 and come in several versions, each with different generation methods and use cases.
Key Features
Why Choose Our UUID Generator?
Common Use Cases
Database Primary Keys
Use UUIDs as primary keys in distributed databases to avoid conflicts and enable offline record creation.
API Request Tracking
Generate unique request IDs for API calls to enable end-to-end request tracing and debugging.
Session Management
Create secure session identifiers that are impossible to guess or predict.
How to Use
Single Generation
- Click the "Generate UUID" button
- Your UUID will appear in the result area
- Click "Copy" to copy to clipboard
- Use the UUID in your application
Bulk Generation
- Select the number of UUIDs to generate
- Choose your preferred UUID version
- Click "Generate Bulk UUIDs"
- Export results in your preferred format
Technical Details
The collision probability is negligible for practical applications. The probability of generating duplicate UUIDs is negligible. For v4, you would need to generate 1 billion UUIDs per second for 85 years to have a 50% probability of one collision.
UUID v4 uses cryptographically secure random number generation, making it suitable for security-sensitive applications. For v4 UUIDs, we use the Web Crypto API's crypto.getRandomValues() for cryptographically strong random number generation, ensuring high-quality randomness.
Our generator uses the browser's native crypto.randomUUID() when available, falling back to a secure polyfill for older browsers. Each UUID version serves different purposes: v1 includes MAC address and timestamp, v3/v5 use hashing for namespace-based generation, v4 uses random or pseudo-random numbers, v6/v7 provide time-ordered values with better database indexing properties.
Frequently Asked Questions
What's the difference between UUID versions?
v1 includes timestamp and MAC address, v3/v5 use namespace hashing (MD5/SHA-1), v4 is random, v6 is like v1 but reordered for databases, v7 uses Unix timestamp for better sorting.
Is UUID v4 truly random and secure?
Yes, our v4 implementation uses the Web Crypto API which provides cryptographically strong random values, making the UUIDs unpredictable and secure.
How many UUIDs can I generate at once?
You can generate up to 1,000 UUIDs in a single batch. For larger quantities, you can generate multiple batches.
Can I use these UUIDs in production?
Absolutely! The generated UUIDs are RFC 4122 compliant and suitable for production use in any application.
Which UUID version should I use?
For most applications, v4 (random) is recommended. Use v1/v6/v7 if you need time-ordering, v3/v5 for deterministic generation from names.
Are UUIDs suitable for security-sensitive applications?
While v4 UUIDs are randomly generated, they should not be used as security tokens. Use proper cryptographic tokens for authentication and security purposes.
How do I generate a UUID?
Select the desired UUID version, adjust any format options if needed, and click 'Generate'. The tool creates the UUID(s) instantly in your browser without any server communication.