When building databases or distributed systems, you often need unique identifiers that don't collide. Our UUID Generator creates standard RFC-4122 version 4 UUIDs (Universally Unique Identifiers) instantly. Whether you need one ID or a thousand, we generate them cryptographically securely in your browser.
What is a UUID?
A UUID (or GUID in Microsoft terms) is a 128-bit number used to identify information in computer systems. It looks like this: 123e4567-e89b-12d3-a456-426614174000. Version 4 UUIDs are random and have such a massive number of combinations that the probability of a duplicate is effectively zero.
Why Use UUIDs?
- Create database keys without checking for existing IDs (no central coordination)
- Merge data from different databases without ID conflicts
- Safe for URL parameters and API resource locators
- Standardized format supported by all major programming languages
- Bulk generation: Get 100 or 1000 IDs in one click
- Cryptographically strong randomness
How to Generate
Select Quantity
Choose how many UUIDs you need (1 to 1000).
Generate
Click the button to produce new random IDs.
Copy
Click "Copy" to put them in your clipboard.
Export
Optionally download as a text file if generating bulk lists.
Key Features
Bulk Generation
Generate lists of distinct UUIDs for testing or seeding.
One-Click Copy
Instantly grab your IDs without manual selection.
RFC Compliant
Follows standard formatting (8-4-4-4-12 hex digits).
Fast & Local
Generation happens in your browser with zero latency.
Uppercase/Lowercase
Option to toggle letter casing.
Best Practices
- Use UUIDs for public-facing resource IDs instead of auto-incrementing integers
- Store UUIDs as binary (16 bytes) in DBs for better performance if possible
- Don't use v4 UUIDs if you need time-ordered sorting (use v7 or CUIDs)
- Always check generation randomness for security-critical tokens
Common Use Cases
Database Keys
Primary keys for users, products, or orders.
Session IDs
Temporary tracking IDs for user visits.
Testing Data
Seeding mock databases with realistic identifiers.
API Request IDs
Tracing requests across microservices.
Frequently Asked Questions
Will these collide?
The chance is astronomically low (1 in 2^122). You are safe.
Is this v1 or v4?
This tool generates Version 4 (Random) UUIDs, the most common type.
Is it GUID compatible?
Yes, UUID and GUID are synonymous terms for the same standard.
Can I generate 10,000?
Yes, though showing them on screen efficiently is capped to ensure performance.
Ready to Get Started?
100% browser-based. Your data never leaves your device.
Open UUID Generator (v4)