Free UUID Generator Online
Generate random UUIDs (Universally Unique Identifiers) instantly. Create unique IDs for databases, APIs, and applications with our free online tool.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is globally unique. Also known as GUID (Globally Unique Identifier), UUIDs are used to identify resources without central coordination.
UUID Format
A standard UUID looks like:
550e8400-e29b-41d4-a716-446655440000
It consists of 32 hexadecimal digits displayed in 5 groups separated by hyphens:
- 8-4-4-4-12 pattern
- 36 characters total (including hyphens)
UUID Versions
Version 4 (Random)
Our generator creates Version 4 UUIDs:
- Generated using random numbers
- Most commonly used version
- Extremely low collision probability
Other versions include:
- V1: Time-based + MAC address
- V3: MD5 hash of namespace + name
- V5: SHA-1 hash of namespace + name
How to Use
- Set the number of UUIDs to generate (1-100)
- Choose your preferred format
- Click "Generate UUID"
- Copy individual UUIDs or all at once
Format Options
- lowercase:
550e8400-e29b-41d4-a716-446655440000 - UPPERCASE:
550E8400-E29B-41D4-A716-446655440000 - {braces}:
{550e8400-e29b-41d4-a716-446655440000}
Common Use Cases
Database Primary Keys
UUIDs as primary keys prevent conflicts in distributed systems.
API Resource Identifiers
GET /users/550e8400-e29b-41d4-a716-446655440000
File Names
Generate unique filenames for uploads.
Session Identifiers
Create unique session tokens for authentication.
Why Use UUIDs?
- Globally unique - No central authority needed
- Unguessable - Random generation for security
- Portable - Works across all systems
- Scalable - Perfect for distributed systems
Why Use Our Tool?
- Generate up to 100 UUIDs at once
- Multiple format options
- One-click copy functionality
- 100% client-side generation
- No data stored or transmitted
Generate unique identifiers instantly!