What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in distributed systems. The standard UUID format is an 8-4-4-4-12 hexadecimal string (e.g., 550e8400-e29b-41d4-a716-446655440000). UUID v4 is randomly generated and is the most commonly used UUID type, widely used for database primary keys, session identifiers, file naming, and more. Our UUID generator supports batch generation with multiple format options to help you quickly get the UUIDs you need.
How to Use
- Use the slider to select how many UUIDs to generate (1-100).
- Choose the output format: lowercase, uppercase, or no-hyphen.
- Click "Generate" to batch generate UUIDs.
- Click "Copy" next to a single UUID, or "Copy All" to copy everything at once.
Features
- ✓ UUID v4 Generation
- ✓ Batch Generate (up to 100)
- ✓ Lowercase Format
- ✓ Uppercase Format
- ✓ No-Hyphen Format
- ✓ Single Copy
- ✓ Copy All
- ✓ Free, No Signup
FAQ
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in distributed systems. UUID v4 is randomly generated with an extremely low collision probability, making it the most commonly used UUID version.
What is the difference between UUID and GUID?
UUID and GUID are essentially the same concept. GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. In most scenarios, they can be used interchangeably.
Are the generated UUIDs safe?
UUID v4 uses random number generation. While collisions are theoretically possible, the probability is extremely low (about 1 in 2^122). It's safe for most applications, but not recommended for cryptographically secure tokens.