UUID Generator
Generate universally unique identifiers (UUIDs) instantly. Perfect for database IDs, tokens, and unique keys.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. UUIDs are standardized by the Open Software Foundation and are commonly used in distributed systems, databases, and software applications.
A UUID looks like this: 550e8400-e29b-41d4-a716-446655440000. The probability of generating the same UUID twice is virtually zero.
UUID Versions
Version 4 (Random)
Most common. Generated using random numbers. Suitable for most use cases where uniqueness is critical.
Version 1 (Timestamp)
Based on timestamp and MAC address. Can be sorted chronologically but may reveal system information.
Version 7 (Unix Epoch)
New standard. Time-ordered, K-sortable, and more efficient than v1. Recommended for new applications.
Features
Generate up to 100 UUIDs at once
Copy single or all UUIDs
View and re-copy generated UUIDs
Save UUIDs as text file
Uses crypto.getRandomValues()
No data sent to servers
Use Cases
Database IDs
Use as primary keys in databases where you need unique identifiers without a central coordinator.
API Keys & Tokens
Generate unique tokens for user authentication, session IDs, or API access keys.
Distributed Systems
Assign unique IDs across multiple systems without requiring a central ID generation service.
File Names
Create unique filenames for uploads, exports, or temp files to avoid collisions.
Frequently Asked Questions
What does UUID stand for?
UUID stands for Universally Unique Identifier. It's a 128-bit number that is almost guaranteed to be unique across all systems and time.
What version should I use?
Version 4 is recommended for most use cases. Version 7 is better for time-ordered IDs. Avoid Version 1 unless you specifically need timestamp ordering.
Can UUIDs collide?
Theoretically yes, but with 2^128 possible combinations, the probability of generating a duplicate is approximately 0.0000000000000004%.
Are these cryptographically secure?
Version 4 UUIDs use crypto.getRandomValues() which provides cryptographically secure random numbers suitable for security-sensitive applications.