What's the difference between UUID versions?

UUID v4 (what we generate) uses random numbers and is the most common. UUID v1 uses timestamps and MAC addresses. UUID v5 uses SHA-1 hashing. V4 is preferred for most applications due to its simplicity and randomness.

Can two UUIDs ever be the same?

The probability of generating duplicate UUIDs is astronomically low (about 1 in 5.3 × 10³⁶). For practical purposes, UUIDs are considered unique.

Are UUIDs secure for sensitive data?

UUIDs are random and unpredictable, making them suitable for non-secret identifiers. However, they shouldn't be used as passwords or encryption keys. For security tokens, use dedicated cryptographic functions.

UUID Generator

Generate unique UUIDs (v4)

Number of UUIDs (max 10)

About This Tool

Generate universally unique identifiers (UUIDs/GUIDs) with our free UUID generator. Create version 4 UUIDs that are cryptographically random and guaranteed to be unique. Essential for developers working with databases, distributed systems, and any application requiring unique identifiers.

Click 'Generate UUID' to create a new UUID
Copy the UUID to your clipboard
Generate multiple UUIDs at once if needed
Use the UUIDs in your database, API, or application
Generate as many as you need - they're always unique

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