UUID Generator
Generate unique identifiers for your applications
Generation Options
Formatting Options
Click "Generate New" to create UUIDs
About UUIDs
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. Also known as GUID (Globally Unique Identifier) in Microsoft systems.
UUID Versions:
- • Version 1: Time-based UUID using timestamp and MAC address
- • Version 4: Random UUID (most common, 122 bits of randomness)
Common Formats:
- • Standard:
550e8400-e29b-41d4-a716-446655440000 - • No Hyphens:
550e8400e29b41d4a716446655440000 - • Braces:
{550e8400-e29b-41d4-a716-446655440000} - • Uppercase:
550E8400-E29B-41D4-A716-446655440000
Use Cases:
- • Database primary keys
- • Session identifiers
- • File or object identifiers
- • Distributed system IDs
- • API request tracking
How to Use
- 1
Select UUID version
Choose between v4 (random) or v1 (time-based)
- 2
Set quantity
Specify how many UUIDs to generate
- 3
Configure format
Choose uppercase, hyphens, or braces options
- 4
Generate
Click Generate to create UUIDs
- 5
Copy results
Copy individual UUIDs or all at once
Frequently Asked Questions
What is a UUID?
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. Also known as GUID (Globally Unique Identifier) in Microsoft systems.
What is the difference between UUID v1 and v4?
What is the difference between UUID v1 and v4?
UUID v1 is time-based and includes a timestamp and MAC address (or random node), while UUID v4 is purely random with 122 bits of randomness. V4 is more commonly used for better privacy.
Are UUIDs truly unique?
Are UUIDs truly unique?
While not mathematically guaranteed to be unique, the probability of generating duplicate UUIDs is so low that they can be considered unique for practical purposes. For v4 UUIDs, you would need to generate billions of UUIDs to have a significant chance of collision.
When should I use UUIDs?
When should I use UUIDs?
UUIDs are ideal for distributed systems, database primary keys, session identifiers, file identifiers, and any scenario where you need globally unique identifiers without central coordination.