Online UUID Generator
Generate UUID/GUID Instantly in Your Browser
GUID/UUID Generator Tool
Generator Settings
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Configure your settings above and click "Generate" to create unique identifiers.
What is an Online UUID Generator?
An online UUID generator is a web-based tool that creates unique identifiers (UUIDs) directly in your browser without requiring any software installation. Our online UUID generator supports multiple versions including UUID v1 (timestamp-based), UUID v4 (random), and UUID v5 (name-based), making it the most comprehensive GUID/UUID generator available online. This free online UUID generator processes everything locally in your browser, ensuring complete privacy and security for your generated identifiers.
UUIDs (Universally Unique Identifiers) are 128-bit numbers represented as 32 hexadecimal characters, typically displayed in five groups separated by hyphens (8-4-4-4-12 format). Our online UUID generator provides various formatting options including uppercase/lowercase conversion and hyphen removal to meet different technical requirements. Whether you need a simple UUID generator or advanced GUID/UUID generator features, this tool covers all your unique identifier generation needs.
Why Use Our Online UUID Generator?
Our online UUID generator is the perfect solution for developers, database administrators, and system architects who need reliable unique identifiers. This GUID/UUID generator eliminates the risk of identifier collisions while maintaining excellent performance and scalability. Unlike other online UUID generator tools, ours operates entirely in your browser for maximum privacy.
Instant Online Generation
Our online UUID generator creates identifiers instantly with guaranteed uniqueness across different systems, networks, and time periods.
Multiple UUID Versions
This GUID/UUID generator supports v1 (timestamp-based), v4 (random), and v5 (name-based) to meet all technical requirements.
Perfect for Database Keys
Use our online UUID generator for database primary keys, especially in distributed systems where auto-incrementing integers aren't practical.
API Development Ready
Essential online UUID generator for REST APIs, microservices, and web applications requiring unique resource identifiers and session tokens.
Privacy & Security First
Our online UUID generator operates locally in your browser - no data transmission to servers, ensuring complete privacy and security.
Bulk UUID Generation
Generate multiple UUIDs at once (1 to 100) with this powerful GUID/UUID generator to streamline your development workflow.
How to Use This Online UUID Generator
- Select your preferred UUID version in our online UUID generator: v4 for random UUIDs, v1 for timestamp-based, or v5 for name-based UUIDs.
- Choose the quantity of UUIDs to generate (1, 5, 10, 25, 50, or 100 at once) using this GUID/UUID generator.
- Configure formatting options in the online UUID generator: toggle uppercase/lowercase and include/exclude hyphens as needed.
- For UUID v5, enter a name and select a namespace (DNS, URL, OID, or X.500) in the generator interface.
- Click "Generate" to create your UUIDs with metadata including version, timestamp, and generation information.
- Copy individual UUIDs or all generated UUIDs to your clipboard with one click from this online UUID generator.
- Download all generated UUIDs as a text file for future reference or bulk import using our GUID/UUID generator.
- Use the "Clear All" button to reset the online UUID generator and start fresh when needed.
Online UUID Generator Privacy Guarantee
Our online UUID generator operates entirely in your browser using client-side JavaScript. No UUIDs, names, or any other data are transmitted to our servers or stored anywhere. This makes our GUID/UUID generator completely secure and private, perfect for generating UUIDs for sensitive applications, production systems, or confidential projects.
Online UUID Generator: Understanding UUID Versions
UUID Version 1 (Time-based) - Online Generator
Our online UUID generator creates v1 identifiers based on the current timestamp and MAC address (or random node identifier). These UUIDs from our GUID/UUID generator are sortable by creation time and useful when you need chronological order.
Generated by online UUID generator - Contains: timestamp, clock sequence, and node information
UUID Version 4 (Random) - Most Popular Online Generator Option
Our online UUID generator uses cryptographically strong random numbers for v4 UUIDs. This is the most commonly used version in our GUID/UUID generator and provides excellent uniqueness guarantees while being completely unpredictable.
Created by online UUID generator - Contains: 122 random bits with 6 bits for version and variant
UUID Version 5 (Name-based SHA-1) - Advanced Online Generator
Our online UUID generator creates v5 identifiers by hashing a namespace and name using SHA-1. The same name and namespace will always produce the same UUID in our GUID/UUID generator, making it deterministic and reproducible.
Produced by online UUID generator - Contains: SHA-1 hash of namespace and name with version bits
Online UUID Generator Use Cases and Applications
Database Primary Keys
Use our online UUID generator to replace auto-incrementing integers with UUIDs for better scalability, security, and distributed system compatibility.
API Resource Identifiers
Our GUID/UUID generator creates unique identifiers for REST API resources, preventing enumeration attacks and improving security.
Session and Request IDs
Generate unique session tokens, request IDs, and correlation IDs using this online UUID generator for tracking and debugging purposes.
File and Document Names
Create unique filenames with our online UUID generator for uploads, temporary files, or document management systems to avoid naming conflicts.
Message Queue IDs
Our GUID/UUID generator identifies messages, jobs, and tasks in distributed systems and message queues with guaranteed uniqueness.
Microservices Architecture
Enable independent services to generate unique identifiers using our online UUID generator without coordination or central authority.
Online UUID Generator: Format and Structure
Our online UUID generator creates standard UUIDs consisting of 32 hexadecimal characters displayed in five groups separated by hyphens, following the pattern 8-4-4-4-12 for a total of 36 characters including hyphens:
- The digit M indicates the UUID version (1, 4, or 5 in our online UUID generator)
- The 1-3 most significant bits of digit N indicate the UUID variant
- Total length: 128 bits (16 bytes) of data generated by our GUID/UUID generator
- With hyphens: 36 characters total from our online UUID generator
- Without hyphens: 32 hexadecimal characters
- Case-insensitive but traditionally lowercase in our online UUID generator
Our online UUID generator provides formatting options to output UUIDs with or without hyphens, and in uppercase or lowercase to match your specific requirements.
Online UUID Generator Best Practices
Choose the Right Version in Your Online UUID Generator
Select UUID v4 for general use, v1 when you need timestamp information, and v5 when you need deterministic generation from names using our GUID/UUID generator.
Database Indexing with Online UUID Generator
Consider using UUID v1 from our online UUID generator for database primary keys if you need better index performance, as they're more sequential than v4.
Security Implications of Online UUID Generator
Use UUID v4 from our GUID/UUID generator for security-sensitive applications as they're unpredictable, avoiding information disclosure through sequential patterns.
Storage and Transmission from Online UUID Generator
Store UUIDs from our online UUID generator as binary data in databases for space efficiency, and use string representation only for display and transmission.
Frequently Asked Questions About Online UUID Generator
What makes this online UUID generator different?
Our online UUID generator operates entirely in your browser with no server communication, supports multiple UUID versions, and offers advanced formatting options. This GUID/UUID generator is completely free and privacy-focused.
Are UUIDs from this online UUID generator truly unique?
Yes, UUIDs from our online UUID generator are probabilistically unique. The probability of generating duplicate UUID v4s is so low (1 in 2^122) that it's considered negligible for practical purposes.
Which version should I choose in the online UUID generator?
Use UUID v4 for general purposes as our online UUID generator provides excellent uniqueness with no information disclosure. Use v1 for sortable IDs or v5 for deterministic UUIDs in our GUID/UUID generator.
Can I use UUIDs from this online UUID generator as database primary keys?
Absolutely! UUIDs from our online UUID generator make excellent primary keys, especially in distributed systems. They eliminate the need for central ID generation and prevent collision issues when merging data.
Is this online UUID generator safe for production use?
Yes, our online UUID generator is completely safe for production use. It uses cryptographically secure random number generation and operates entirely in your browser for maximum security and privacy.
How do I store UUIDs from the online UUID generator efficiently?
Store UUIDs from our GUID/UUID generator as binary data (16 bytes) rather than strings (36 characters) to save space and improve performance. Most databases provide native UUID storage options.
Can I use this online UUID generator offline?
Once loaded, our online UUID generator can work offline since all processing happens in your browser. This makes our GUID/UUID generator perfect for offline development environments and air-gapped systems.
What information does UUID v1 from the online UUID generator contain?
UUID v1 from our online UUID generator contains timestamp, clock sequence, and node information. While this makes them sortable and traceable, it may reveal generation time and location information.