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UUID Generator

Generate random UUIDs (Version 4)

Related Tools

  • Hash Generator - create unique identifiers from data
  • Password Generator - generate secure random strings
  • Number Base Converter - convert between hex and other bases

How to Use UUID Generator

  1. Click Generate

    Click the Generate button to create a new UUID (Universally Unique Identifier).

  2. Choose format options

    Select uppercase/lowercase and whether to include hyphens.

  3. Copy the UUID

    Click the Copy button to copy the generated UUID to your clipboard.

Frequently Asked Questions

Is this UUID Generator free to use?
Yes, our UUID Generator is completely free with no limits. Generate as many UUIDs as you need, whether it is one or thousands, without any registration or cost.
Are the generated UUIDs truly random and unique?
Yes, our generator uses your browser's built-in crypto.randomUUID() function, which relies on cryptographically secure random number generation. This ensures that each UUID is virtually guaranteed to be unique. The probability of generating duplicate UUIDs is astronomically low (about 1 in 2^122).
What is a UUID and when should I use one?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all devices and time. UUIDs are commonly used as database primary keys, session identifiers, file names, and any situation where you need a unique identifier without coordinating with a central authority.
What is the difference between UUID versions?
This tool generates Version 4 (v4) UUIDs, which are based on random numbers and are the most commonly used type. Other versions include v1 (timestamp-based), v3 and v5 (namespace-based using MD5 or SHA-1), and v7 (time-ordered). V4 is ideal for most use cases where you simply need a random unique identifier.
Is my data private when generating UUIDs?
Absolutely. UUID generation happens entirely in your browser using JavaScript's native crypto API. No data is sent to any server, and the generated UUIDs are never stored or logged. Your generated identifiers remain completely private.