What is UUID/GUID Generator?
A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit number used to identify information in computer systems. The probability of generating a duplicate UUID is so close to zero that they are effectively unique across the entire universe, without need for a central coordination authority. This tool supports the two most common versions: Version 4 (UUID v4), which is purely random and most widely used; and Version 1 (UUID v1), which is generated using a timestamp and the node's MAC address (simulated here for privacy). UUIDs are the standard for database primary keys, session IDs, and transaction markers in modern distributed systems.
Input Formats
- Quantity (1-1000)
- Version (v4 or v1)
- Hyphens (Include/Exclude)
Output Results
- List of UUID strings
- Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
- Copy/Download options
Key Features
Who is this for?
Database Keys
Developers generating UUIDs to use as primary keys in databases like PostgreSQL or MongoDB.
Session Management
Creating unique session identifiers for tracking user activity in web applications.
Testing & Mocking
QA engineers generating bulk UUIDs to populate test databases or mock API responses.
How to Use
Select the UUID Version (v4 is recommended for most use cases).
Enter the quantity you need (e.g., 5).
Click 'Generate'.
Copy the list or download as a text file.
Examples
Input
Generate 1 UUID v4Output
f47ac10b-58cc-4372-a567-0e02b2c3d479Common Errors
- Assuming v1 is random (it contains time/mac info)
- Using UUIDs for security tokens (they are predictable)
- Storing as string instead of binary (inefficient in DB)
Code Examples
JavaScript (Web Crypto)
const uuid = crypto.randomUUID();
console.log(uuid);Python
import uuid
print(uuid.uuid4())