UUID Generator
Generate cryptographically secure UUID v4 identifiers for databases, APIs, and applications
Introduction
Need unique identifiers for database records, API request tracking, session tokens, or file naming? Our UUID Generator creates cryptographically secure UUID v4 identifiers instantly using your browser's built-in crypto.randomUUID() API. Generate 1-50 UUIDs at once, copy individual IDs with one click, or copy all generated UUIDs as a list for batch operations. Perfect for developers building distributed systems, testers seeding data, or anyone needing guaranteed-unique identifiers without server coordination. Auto-copy mode speeds up workflows when you need IDs one at a time. Everything works offline with no external dependencies, and your generated UUIDs are completely private to your device.
Who Should Use This Tool?
- Backend developers implementing database schemas and needing unique primary keys for distributed systems
- Full-stack engineers building REST APIs and microservices that require request tracking and correlation IDs
- Software testers creating mock data and seeding test databases with unique identifiers
- DevOps engineers configuring cloud resources, containers, and infrastructure with unique naming
- Database administrators managing distributed databases across multiple servers or datacenters
- Frontend developers implementing offline-first applications with client-side ID generation
- Security engineers building authentication systems requiring unpredictable session tokens
- QA automation engineers generating test data for end-to-end testing scenarios
- System integrators connecting disparate systems that need universal unique identifiers
- Mobile app developers implementing offline data sync with guaranteed unique record IDs
How This Tool Works
The UUID Generator leverages the browser's native Web Crypto API to create RFC 4122 compliant UUID v4 identifiers with cryptographic-grade randomness. When you click the generate button, the tool calls crypto.randomUUID() which uses the browser's cryptographically secure random number generator (CSPRNG) to produce 128-bit identifiers with 122 random bits and 6 fixed bits for version and variant markers. Each UUID consists of 32 hexadecimal characters organized into five groups separated by hyphens (8-4-4-4-12 format), such as '550e8400-e29b-41d4-a716-446655440000'. The tool supports batch generation of 1-50 UUIDs simultaneously using a slider control or quick-action buttons for common quantities. Each generated UUID is displayed with a timestamp and individual copy button for selective copying, while a 'Copy All' button allows copying the entire batch as a newline-separated list perfect for bulk imports. The auto-copy feature eliminates manual copying for single UUID workflows by automatically placing the generated ID on your clipboard. All generation happens entirely client-side with no network requests, no external dependencies, and no data leaving your device, making it ideal for security-sensitive applications and offline development environments. The generated UUIDs are suitable for any use case requiring unique identifiers, from database primary keys to session tokens.
Try UUID Generator Now
Use the interactive tool below to get instant results
Cryptographically Secure UUIDs
Generated using the browser's crypto.randomUUID() API, which produces random version 4 UUIDs with proper entropy.
Generate UUIDs
No UUIDs Generated Yet
Click the generate button above to create UUIDs
💡 About UUID v4
- • Format: 8-4-4-4-12 hexadecimal digits (e.g., 550e8400-e29b-41d4-a716-446655440000)
- • Version 4: Randomly generated using cryptographically strong random numbers
- • Uniqueness: 122 random bits provide ~5.3×10³⁶ possible UUIDs
- • Collision Probability: Practically zero - you'd need to generate billions per second for years
- • Use Cases: Database primary keys, session IDs, file names, distributed systems
🚀 Quick Tips
- • Use the slider or quick buttons to generate multiple UUIDs at once
- • Enable auto-copy for quick single UUID generation
- • Hover over UUIDs to see the copy button appear
- • Click "Copy All" to get all UUIDs as a newline-separated list
- • Generated UUIDs stay until you clear them or refresh the page
🔒 Security & Standards
- • Uses the Web Crypto API's
crypto.randomUUID()method - • Complies with RFC 4122 UUID version 4 specification
- • Cryptographically secure random number generation (CSPRNG)
- • No external libraries or network requests required
- • Supported in all modern browsers (Chrome 92+, Firefox 95+, Safari 15.4+)
How to Use UUID Generator
Select Quantity
Use the slider to choose how many UUIDs to generate at once (1-50), or click the quick generation buttons for common amounts like 1, 5, or 10 UUIDs. The slider gives you precise control for any quantity, while quick buttons speed up common workflows without adjusting the slider.
Generate UUIDs
Click the "Generate" button to create cryptographically secure UUIDs using the Web Crypto API. Each UUID follows RFC 4122 standards with 122 random bits, ensuring virtually zero collision probability. Enable the auto-copy checkbox to automatically copy single UUIDs to your clipboard the moment they're generated, eliminating the manual copy step.
Copy Results
Hover over any generated UUID to reveal its copy button, then click to copy that specific UUID to your clipboard. Alternatively, use the "Copy All" button to copy all generated UUIDs as a newline-separated list, perfect for pasting into spreadsheets, scripts, or database seed files in one operation.
Manage History
All generated UUIDs remain visible in the list with timestamps showing when each was created. Review previous generations, copy older UUIDs as needed, or click "Clear All" to remove the entire list and start fresh. The history persists across generations until you clear it manually.
Use Cases for UUID Generator
Database Primary Keys
Generate unique identifiers for database records without coordination between servers or worrying about auto-increment conflicts. Perfect for distributed systems, microservices, or multi-datacenter deployments where independent ID generation prevents bottlenecks and eliminates the need for centralized ID servers.
API Request Tracking
Create unique identifiers for tracking API requests, responses, and errors across logs, monitoring systems, and distributed microservices. UUIDs help correlate events across services, debug complex request flows, and troubleshoot issues by following a single request ID through your entire infrastructure.
Session and Authentication Tokens
Generate secure session tokens for user authentication, session tracking, and temporary access tokens in web applications. Cryptographically secure UUIDs provide unpredictable identifiers that resist brute-force guessing, making them suitable for security-sensitive applications without custom token generation code.
File Naming and Uploads
Create unique file names for user uploads, temporary files, cache entries, or generated documents to prevent naming conflicts. UUIDs eliminate race conditions when multiple users upload files simultaneously, ensure cache uniqueness, and prevent accidental file overwrites in shared storage systems.
Testing and Data Seeding
Generate batches of unique IDs for populating test databases, creating mock data, or seeding development environments. The batch generation feature (1-50 UUIDs) makes it easy to create realistic test datasets with proper unique identifiers without writing ID generation code.
Key Features
100% Private and Offline
All UUID generation happens entirely in your browser using the built-in crypto.randomUUID() API. No network requests are made, no external libraries are loaded, and your UUIDs never leave your device. Works completely offline with the same cryptographic security as online tools.
Cryptographically Secure
Uses the Web Crypto API's cryptographically secure random number generator (CSPRNG) to produce RFC 4122 compliant UUID v4 identifiers. The quality of randomness is suitable for security-sensitive applications like session tokens and authentication systems.
Batch Generation
Generate 1-50 UUIDs at once using the slider or quick buttons for common quantities (1, 5, 10). Batch generation is perfect for seeding test data, creating multiple database records, or preparing sets of unique identifiers for bulk operations without clicking generate repeatedly.
Auto-Copy Mode
Enable auto-copy to automatically place single UUIDs on your clipboard the moment they're generated. Speeds up workflows when you need UUIDs one at a time for immediate use, eliminating the manual copy step and reducing clicks.
Copy All Functionality
Copy all generated UUIDs as a newline-separated list with one click. Perfect for pasting into spreadsheets, scripts, configuration files, or database seed data. The list format makes it easy to import UUIDs into tools that accept line-by-line input.
No External Dependencies
Uses only native browser APIs with no external libraries, frameworks, or npm packages. The tool loads instantly, has zero security vulnerabilities from dependencies, and works reliably across all modern browsers without compatibility issues.
Frequently Asked Questions
Are these UUIDs secure enough for sensitive applications?
Yes. The tool uses crypto.randomUUID() which employs the Web Crypto API's cryptographically secure random number generator (CSPRNG). These UUIDs are suitable for security-sensitive applications like session tokens, API keys, and authentication systems. However, UUIDs alone shouldn't be used as passwords or encryption keys.
How unique are UUID v4 identifiers? Can they collide?
UUID v4 provides 5.3×10³⁶ (5.3 undecillion) possible unique values with 122 random bits. The collision probability is so low it's considered practically zero. You would need to generate billions of UUIDs per second for many years to have even a tiny chance of collision - for practical purposes, they're guaranteed unique.
Can I use these UUIDs in databases as primary keys?
Absolutely! UUIDs are excellent for database primary keys, especially in distributed systems. They allow independent ID generation without coordination between servers, preventing bottlenecks. Many databases (PostgreSQL, MySQL 8.0+, MongoDB) have native UUID support. Store them as binary (16 bytes) for better performance than string storage (36 characters).
What's the difference between UUID v4 and other versions?
UUID v1 uses timestamp and MAC address (can reveal hardware info), v3/v5 use namespace and name hashing (deterministic), while v4 uses random generation. V4 is most common because it's simple, secure, doesn't leak system information, and requires no input. It's the recommended choice for most applications.
Do I need an internet connection to generate UUIDs?
No. The tool works completely offline using the browser's built-in crypto.randomUUID() function. No network requests are made, no external libraries are loaded, and generation happens locally in your browser with the same cryptographic security as online tools. Perfect for offline development or air-gapped environments.