What is a UUID Generator?
UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It is widely used wherever unique identifiers are needed, such as database records, API keys, and session IDs.
This tool generates the most widely used UUID version 4 (v4). Version 4 is based on cryptographically secure random numbers, with an extremely low probability of collision, making it safe for production use.
Key Features
UUID v4 Generation
Instantly generate cryptographically secure random-based UUID v4 identifiers.
Bulk Generation
Generate up to 100 UUIDs at once with a single click.
Case Conversion
Freely switch between uppercase (A-F) and lowercase (a-f) formats.
Hyphen Options
Output UUIDs with or without hyphens based on your preference.
One-Click Copy
Copy individual UUIDs or the entire list to your clipboard instantly.
Generation History
View and re-copy all UUIDs generated during your current session.
How to Use
- Set Count — Use the slider to set the number of UUIDs you want to generate (1-100).
- Configure Options — Choose uppercase/lowercase and hyphen inclusion/removal options.
- Generate UUIDs — Click the 'Generate' button to instantly create UUIDs.
- Copy Results — Use individual copy buttons or the copy all button to save to clipboard.
Use Cases
Database Primary Keys
Use as Primary Keys (PK) in database tables to uniquely identify records even in distributed systems.
API Keys / Token Generation
Generate secure identifiers for API authentication keys, session tokens, and temporary access keys.
File Name Generation
Automatically generate unique file names for uploads to prevent naming conflicts.
Test Data
Use as unique IDs for mock data in development and testing environments.
Microservice Tracking
Use as unique Correlation IDs to track requests across distributed systems.
Frequently Asked Questions
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It is designed to be unique across all systems without requiring a central authority.
How is UUID v4 generated?
UUID v4 is generated using cryptographically secure random numbers. Of the 128 bits, 6 bits are fixed for version and variant information, and the remaining 122 bits are randomly generated. The probability of collision is extremely low.
Can I remove hyphens from a UUID?
Yes, hyphens are only for readability and do not affect the uniqueness of the UUID. Storing UUIDs without hyphens as 32 characters can save storage space in databases.
Are UUIDs sequential?
UUID v4 is completely random and not sequential. If you need sequential IDs, consider UUID v7 or other methods.
Can I generate multiple UUIDs at once?
Yes, this tool allows you to generate up to 100 UUIDs at once. Set the desired count and click the generate button. You can also toggle uppercase/lowercase and hyphen inclusion.
Privacy Notice
This UUID generator performs all processing in your browser. Generated UUIDs are never sent to any server, and the history is completely cleared when you close the page. No data is stored externally, so you can use it with complete confidence.