UUID/GUID Generator
Complete guide for generating unique identifiers
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are 128-bit identifiers used to uniquely identify information in computer systems. They're designed to be unique across space and time without requiring a central authority.
Standard UUID Format:
xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxxWhere M indicates the version and N indicates the variant (usually 8, 9, A, or B)
✅ Perfect for:
- Database primary keys
- API request/response IDs
- Session identifiers
- File and resource naming
- Distributed system coordination
🎯 Key Benefits:
- No central authority needed
- Extremely low collision probability
- Can be generated offline
- Standardized format (RFC 4122)
- Cross-platform compatibility
Different UUID versions serve different purposes. Choose the version that best fits your use case.
Generated using timestamp and MAC address. Provides natural sorting by creation time.
550e8400-e29b-11d4-a716-446655440000Generated using random or pseudo-random numbers. Most commonly used version.
f47ac10b-58cc-4372-a567-0e02b2c3d479Time-ordered with random data. Combines benefits of v1 and v4 without privacy concerns.
018f4e7c-8b2a-7000-9000-123456789abcChoose the format that best matches your application's requirements. Different formats are useful for different contexts.
f47ac10b-58cc-4372-a567-0e02b2c3d479Most common format with hyphens
F47AC10B-58CC-4372-A567-0E02B2C3D479Standard format in uppercase
f47ac10b58cc4372a5670e02b2c3d479Compact format without separators
{f47ac10b-58cc-4372-a567-0e02b2c3d479}Microsoft GUID format with braces
Generate single UUIDs for immediate use or bulk generate multiple UUIDs for batch operations.
🎯 Single Generation
Perfect for immediate use in applications, testing, or one-off requirements.
- Instant generation
- Easy copy to clipboard
- Quick regeneration
📦 Bulk Generation
Generate up to 1000 UUIDs at once for database seeding, testing, or batch operations.
- 1-1000 UUIDs per batch
- Download as text file
- Copy all to clipboard
Performance Tips:
- Generation happens instantly in your browser
- No network requests required
- Large batches (500+) may take a moment to display
- All UUIDs are cryptographically secure
Use the generated UUIDs in your applications by copying them to clipboard or downloading as files.
📋 Copy to Clipboard
Quick access for immediate use in code, databases, or configuration files.
💾 Download as File
Save bulk UUIDs as text files for batch processing or future use.
Database Primary Keys
Use UUIDs as primary keys to avoid conflicts in distributed databases and enable easy data merging.
CREATE TABLE users (id UUID PRIMARY KEY DEFAULT gen_random_uuid(), ...);API Request Tracking
Generate unique request IDs for API calls to enable tracing and debugging across microservices.
X-Request-ID: f47ac10b-58cc-4372-a567-0e02b2c3d479Session Management
Create secure session identifiers that are impossible to guess or enumerate.
sessionId: "f47ac10b-58cc-4372-a567-0e02b2c3d479"File and Resource Naming
Generate unique filenames to prevent conflicts in cloud storage or content management systems.
upload_f47ac10b-58cc-4372-a567-0e02b2c3d479.jpgChoose the Right Version
Use v4 for general purposes, v1 when you need time-based sorting, and v7 for modern time-ordered needs.
Store as Binary When Possible
In databases, store UUIDs as binary (16 bytes) rather than strings (36 chars) for better performance.
Index Considerations
Random UUIDs (v4) can cause index fragmentation. Consider v1 or v7 for high-insert scenarios.
Validate Input UUIDs
Always validate UUID format and version when accepting UUIDs from external sources.