UUID Generator
Generate unique UUIDs (v4) for applications, databases, APIs, and software development.
Click Generate to create UUIDs...
FAQ
UUID Generator FAQ
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The format is: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (36 characters with hyphens).
What is UUID version 4?
UUID v4 is randomly generated using cryptographic random numbers. The "4" in the third group indicates the version. It provides 122 bits of randomness, making collisions virtually impossible.
Can two UUIDs ever be the same?
Theoretically yes, but practically no. The probability of generating a duplicate UUID v4 is astronomically low — you would need to generate 2.71 quintillion UUIDs to have a 50% chance of one collision.
What are UUIDs used for?
UUIDs are used as database primary keys, API identifiers, session tokens, file names, transaction IDs, and anywhere you need a unique identifier without a central authority.
Should I include hyphens in UUIDs?
The standard format includes hyphens (8-4-4-4-12 pattern) for readability. Some systems accept UUIDs without hyphens. Our tool lets you choose either format.
Free UUID Generator — Version 4
Generate universally unique identifiers (UUIDs) instantly with our free UUID v4 generator. UUID v4 uses cryptographic randomness to produce identifiers with 122 bits of entropy, making collisions virtually impossible. Use generated UUIDs as database primary keys, API identifiers, session tokens, transaction IDs, or anywhere you need a unique identifier without central coordination. Generate single or bulk UUIDs with options for uppercase/lowercase and with/without hyphens.
How to Use This Tool
- Click Generate to create a new UUID.
- Choose format options: hyphens or no hyphens, uppercase or lowercase.
- Generate multiple UUIDs at once for bulk needs.
Key Features
- UUID v4 (random) generation using Web Crypto API
- Standard format (8-4-4-4-12) with optional hyphen removal
- Bulk generation for multiple UUIDs at once
- One-click copy to clipboard
- Collision probability is astronomically low
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