UUID v4 Generator
Generate cryptographically secure UUID version 4 identifiers
UUID (Universally Unique Identifier) version 4 uses random or pseudo-random numbers. The format is:
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx- Database primary keys
- API request/response IDs
- Session identifiers
- File naming
- Distributed system identifiers
- Transaction tracking
- Message queue IDs
- Microservice correlation IDs
Step-by-Step Instructions
- Set the quantity of UUIDs you need (1-100) using the number input
- Click "Generate New" to create fresh UUIDs and replace any existing ones
- Use "Generate More" to add additional UUIDs to your current list
- Click on any individual UUID to copy it to your clipboard instantly
- Use "Copy All" to copy all generated UUIDs as a list separated by line breaks
- Click "Download" to save all UUIDs as a text file for later use
- Use "Clear" to remove all generated UUIDs and start fresh
Advanced Features
- Bulk Generation: Generate up to 100 UUIDs at once for large-scale projects
- Incremental Generation: Add more UUIDs without losing existing ones
- Auto-numbering: Each UUID is numbered for easy reference and organization
- File Export: Download UUIDs with timestamp-based filename for version control
- Cryptographic Security: Uses browser's secure random number generator
Key Benefits
- Database Design: Perfect for primary keys in distributed databases where auto-increment IDs aren't suitable
- System Integration: Unique identifiers that work across different systems and platforms without coordination
- Performance Optimization: No need for centralized ID generation, reducing bottlenecks in distributed systems
- Data Privacy: Non-sequential IDs prevent enumeration attacks and information leakage
- Offline Generation: Create unique identifiers without network connectivity
Real-World Applications
- Database Primary Keys: Non-sequential keys for user accounts, orders, and transactions
- API Development: Request IDs, session tokens, and correlation tracking across microservices
- File Management: Unique filenames for uploads, temporary files, and content management systems
- Message Queues: Message IDs for RabbitMQ, Apache Kafka, and other messaging systems
- Distributed Systems: Node identification and transaction IDs in blockchain and distributed ledgers
- Game Development: Player IDs, session IDs, and item identifiers in multiplayer games
- IoT Applications: Device identifiers and sensor data correlation in Internet of Things projects
How unique are UUID v4 identifiers?
UUID v4 uses 122 bits of randomness, providing approximately 5.3 x 10^36 possible values. The probability of generating a duplicate is so low it's considered practically impossible for normal use cases. You'd need to generate billions of UUIDs to have even a tiny chance of collision.
Can I use these UUIDs as database primary keys?
Yes, UUIDs are excellent for database primary keys, especially in distributed systems. They eliminate the need for centralized ID generation and prevent ID conflicts when merging data from different sources. However, consider indexing performance implications for very large tables.
What makes this generator cryptographically secure?
Our generator uses the browser's Web Crypto API, which provides cryptographically strong pseudo-random number generation. This ensures that UUIDs cannot be predicted or reverse-engineered, making them suitable for security-sensitive applications.
How do UUID v4 compare to other UUID versions?
UUID v4 relies purely on random numbers, making it the most widely used version. Unlike v1 (uses MAC address and timestamp) or v5 (uses namespace and name hashing), v4 provides maximum privacy and unpredictability while maintaining global uniqueness.
Uniqueness
Extremely low probability of duplication (practically zero for reasonable numbers)
Format
36 characters: 32 hexadecimal digits + 4 hyphens
Standards
RFC 4122 compliant, widely supported across languages and systems