UUID (Universally Unique Identifier) is a 128-bit number guaranteed to be unique. It's used to identify information in computer systems.

What's the difference between UUID versions?

v4 uses random numbers and is most common. v1 uses timestamp and MAC address. v5 uses namespace and name hashing. v4 is recommended for most uses.

How do I generate multiple UUIDs?

Use the bulk generation feature! Enter the number of UUIDs you need and click Generate to create them all at once.

Can I validate a UUID?

Yes! Paste any UUID into the validation field and the tool will check if it's formatted correctly and identify its version.

Are UUIDs truly unique?

While technically possible to generate duplicates, the probability is so low (1 in 2^122) that UUIDs are considered unique for practical purposes.

UUID Generator

Generate and validate UUIDs (Universally Unique Identifiers)

Format8-4-4-4-12

Characters36

Hex Digits32

Version4 (Random)

Format8-4-4-4-12

Characters36

Hex Digits32

Version4 (Random)

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE).

The UUID v4 format uses random or pseudo-random numbers to generate identifiers. The probability of generating duplicate UUIDs is extremely low—approximately 1 in 2^122, making them practically unique for most applications. This makes UUIDs ideal for distributed systems where generating unique identifiers without central coordination is necessary.

A typical UUID looks like this: 550e8400-e29b-41d4-a716-446655440000. The format is 8-4-4-4-12 hexadecimal digits separated by hyphens.

Generate Single UUID: A new UUID v4 is automatically generated when you open the page. Click "Generate New UUID" to create another one. Use the "Copy" button to quickly copy it to your clipboard.
Bulk Generation: Enter the number of UUIDs you need (up to 100) and click "Generate X UUIDs". All UUIDs will appear in a text area where you can copy them all at once.
Validate UUID: Paste any UUID into the validation field and click "Validate UUID" to check if it's properly formatted according to RFC 4122 standards.
UUID Analysis: View the breakdown of the current UUID showing its components (Time Low, Time Mid, Version, Variant, and Node).

Database Primary Keys: Use UUIDs as unique identifiers for database records across distributed systems without coordination.
API Development: Generate unique request IDs, transaction IDs, or resource identifiers in REST APIs.
File Naming: Create unique filenames for uploads or temporary files to avoid conflicts.
Session IDs: Generate unique session identifiers for user authentication and tracking.
Distributed Systems: Ensure uniqueness across multiple servers or microservices without a central authority.
Testing & Development: Generate test data with guaranteed unique identifiers.
Message Queues: Create unique message IDs for tracking in queue systems like RabbitMQ or Kafka.

UUID v1: Time-based UUIDs that include the MAC address and timestamp. While unique, they can reveal information about when and where the UUID was generated.

UUID v4 (this tool): Randomly generated UUIDs. Most commonly used due to their simplicity and privacy (no MAC address exposure).

UUID v5: Name-based UUIDs using SHA-1 hashing. Useful when you need reproducible UUIDs from the same input.

💡 For most applications, UUID v4 (random) is the recommended choice.

Client-side generation: All UUIDs are generated in your browser using cryptographically secure random values. No data is sent to any server.
Predictability: UUID v4 uses random values, making them impossible to guess or predict, suitable for security-sensitive applications.
No personal information: Unlike v1 UUIDs, v4 doesn't include MAC addresses or timestamps that could identify your device.
Collision probability: With proper random number generation, the chance of collision is astronomically low (1 in 5.3 × 10³⁶ for a single duplicate).

A UUID consists of 32 hexadecimal digits displayed in 5 groups:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

8 digits: Time low
4 digits: Time mid
4 digits: Version (4) and time high
4 digits: Variant and clock sequence
12 digits: Node (random in v4)

UUID Generator

What is a UUID?

How to Use This Tool

Common Use Cases

UUID Versions Explained

Security & Privacy Considerations

UUID Format & Structure