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    UUID Generator

    A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier with a negligible chance of collision, making it ideal for database keys, session tokens, and distributed systems. This free generator creates standards-compliant UUIDs instantly in your browser. Generate one or many and copy them with a click.

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    How to generate a UUID

    1. Open the generator. A fresh UUID is created instantly in your browser.
    2. Choose how many UUIDs you need if you want a batch.
    3. Click generate to produce new identifiers at any time.
    4. Copy the UUIDs and use them as database keys, request IDs, or anywhere a unique identifier is needed.

    Frequently Asked Questions

    What is a UUID?

    UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. Also known as GUID (Globally Unique Identifier), UUIDs are designed to have a negligible chance of collision, making them perfect for generating unique IDs across distributed systems.

    What are UUIDs used for?

    UUIDs are commonly used as database primary keys, transaction IDs, session identifiers, file names, or anywhere a unique identifier is needed without requiring central coordination. They're particularly valuable in distributed systems where multiple systems need to generate IDs independently.

    What's the difference between UUID versions?

    Different UUID versions use different generation algorithms: Version 1 uses timestamp and MAC address, Version 4 uses random numbers, Version 5 uses namespace and name hashed with SHA-1. Version 4 (random) is most commonly used for its simplicity and good uniqueness properties.

    How unique are UUIDs really?

    The probability of generating a duplicate UUID v4 is extremely low - you'd need to generate about 2.7 quintillion UUIDs to have a 50% chance of a single collision. For perspective, generating 1 billion UUIDs per second would take 85 years to reach that number.

    Are UUIDs case-sensitive?

    UUID values themselves are not case-sensitive since they're just hexadecimal numbers. However, in some programming contexts or databases, they might be stored and compared as case-sensitive strings, so it's best practice to maintain consistent case (typically lowercase).

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