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UUID Generator

Generate UUID v1, v4, and v5 universally unique identifiers instantly. Create single or bulk UUIDs for databases, APIs, and distributed systems.

Used 22.8K times today

How to Use UUID Generator

  1. 1

    Select UUID version

    Choose between UUID v1 (timestamp-based), v4 (random), or v5 (namespace + name) based on your use case.

  2. 2

    Set quantity

    Enter how many UUIDs you need — generate from 1 to 100 at a time.

  3. 3

    Copy your UUIDs

    Click "Generate" then copy individual UUIDs or the entire list to your clipboard.

Frequently Asked Questions

What is the difference between UUID v1 and v4?
UUID v1 is generated from the current timestamp and machine MAC address, making it time-ordered but potentially revealing device information. UUID v4 is fully random, offering better privacy and is the most commonly used version for general purposes.
Are generated UUIDs truly unique?
UUID v4 has 122 bits of randomness, giving roughly 5.3×10^36 possible values. The probability of a collision is astronomically small — effectively zero for any realistic application.
What is a GUID vs a UUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical and interchangeable in modern systems.

About UUID Generator

The UUID Generator creates standards-compliant Universally Unique Identifiers for use as primary keys in databases, correlation IDs in distributed systems, session tokens, and anywhere else a guaranteed-unique identifier is required. UUID v4 (random) is the most popular choice for new projects due to its simplicity and privacy properties.

This tool generates UUIDs entirely in the browser using the Web Crypto API for cryptographically secure randomness. You can generate up to 100 UUIDs in one batch, each formatted in the standard 8-4-4-4-12 hyphenated notation ready to copy directly into your code or database migration scripts.

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