UUID Generator
Generate unique UUID v4 identifiers instantly. Perfect for databases, APIs, and unique keys.
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About UUIDs
A UUID (Universally Unique Identifier) is a 128-bit identifier that is globally unique. UUIDs are used in software development for creating unique keys without requiring a central authority.
UUID Versions
- UUID v1: Generated using timestamp and MAC address. Reveals creation time.
- UUID v4: Generated using random numbers. Most commonly used version.
UUID Format
A standard UUID looks like: 550e8400-e29b-41d4-a716-446655440000
- 32 hexadecimal digits
- Displayed in 5 groups separated by hyphens
- Format: 8-4-4-4-12
Use Cases
- Database primary keys
- Distributed systems identifiers
- Session tokens
- File naming
- API request tracking
Frequently Asked Questions
UUID v4 has 122 random bits, providing about 5.3 × 10^36 possible values. The probability of generating duplicate UUIDs is astronomically small—you'd need to generate 1 billion UUIDs per second for 100 years to have a 50% chance of a collision.
UUID v4 is recommended for most use cases. It's simple, random, and doesn't reveal any information about when or where it was created. Use v1 only if you need timestamp-based ordering.
While UUIDs are random, they're not designed for use as passwords. Use a dedicated password generator for creating secure passwords.