Online UUID Generator

Need to generate universally unique identifiers (UUID) for your projects? Our tool creates UUIDs in different versions quickly and securely.

What is UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in distributed systems. Each UUID is practically impossible to duplicate.

👉 Standard format: 550e8400-e29b-41d4-a716-446655440000

Available UUID versions

UUID v1 (Time-based)

Uses timestamp and MAC address. Guarantees temporal uniqueness but may expose system information.

UUID v3 (Namespace-based MD5)

Generated from a namespace and name using MD5 hash. Always produces the same result for the same inputs.

UUID v4 (Random)

Completely random. It's the most used version for being simple and secure.

UUID v5 (Namespace-based SHA-1)

Similar to v3, but uses SHA-1. More secure than MD5 for critical applications.

How to use the UUID generator

1. Select the desired version (v1, v3, v4, or v5).
2. For v3 and v5, enter the namespace and name.
3. Click Generate UUID.
4. Use the Copy button to use the generated UUID.

✅ The tool shows information about the generated UUID.

Practical use examples

• Software development: unique identifiers in databases.
• APIs and microservices: tracking requests and transactions.
• Distributed systems: synchronization between different servers.
• Files and documents: unique names to avoid conflicts.
• User sessions: secure identification of web sessions.

Frequently Asked Questions (FAQ)

Which UUID version should I use?

For most cases, use UUID v4 (random). It's simple, secure, and widely supported.

Are UUIDs really unique?

Yes, the probability of duplication is astronomically low (1 in 5.3 x 10³⁶ for v4).

Can I use UUID as primary key?

Yes, many modern databases support UUID as primary key.

Is UUID v1 secure?

It works well, but may expose system information. For maximum privacy, prefer v4.

UUID advantages

• Decentralization: can be generated without central coordination.
• Scalability: ideal for distributed systems.
• Compatibility: supported by virtually all languages.
• Security: impossible to guess or enumerate.

UUID curiosities

• The UUID standard was defined in RFC 4122 in 2005.
• A UUID v4 has only 0.00000000000000000006% chance of duplication.
• Microsoft uses GUIDs (Globally Unique Identifiers), which are equivalent to UUIDs.
• UUIDs are used in systems like Active Directory, PostgreSQL, and MongoDB.

➡️ Generate your unique UUID right now with our tool!