Free Random GUID/UUID Generator

This free online tool allows you to generate random GUID (Globally Unique Identifier) or UUIDs (Universally Unique Identifier).

Random GUID Generator


What is a random GUID generator?

You can easily generate Globally Unique Identifiers (GUIDs) with this Random GUID Generator. These uniquely identifying strings are generated locally using JavaScript within the online GUID generator, to make sure no data is transmitted over the internet.

You can use GUID identifiers in programs or testcases. If you need to store an item or query a unique thing from a database, we recommend using GUIDs as these are unique strings that cannot be guessed. In contrast with auto-incremented identifiers, these identifiers are much more secure to use.

Why use Random GUID Generator?

Utilizing a Random GUID Generator offers several advantages and use cases:

  • Global Uniqueness: GUIDs (Globally Unique Identifiers) generated by a Random GUID Generator are designed to be globally unique. The randomization process significantly reduces the likelihood of duplication, ensuring that each generated identifier is highly distinctive.
  • Security: Random GUIDs enhance security by providing a level of unpredictability. The random nature of the generated identifiers makes it challenging for malicious entities to predict or manipulate them, contributing to improved security in various applications.
  • Data privacy: When using this online Random GUID Generator, the generation process loccurs locally in your browser. This means that the data used to create the GUIDs doesn't need to be transmitted over the internet, contributing to enhanced data privacy.
  • Promo Code Generation: Random GUIDs are often employed in e-commerce for generating unique promo codes. This ensures that each promotional code is distinct, reducing the risk of abuse or exploitation. You could for example use this as mock-data for a testcase that needs to test a coupon code in a shopping cart.

How unique is a GUID?

A GUID is designed to be extremely unique, but the degree of uniqueness is not absolute. GUIDs are 128-bit values and their uniqueness is primarily achieved through a combination of factors:

  • Randomness: Many modern GUIDs are generated using algorithms that incorporate random or pseudo-random components. This randomness contributes significantly to uniqueness, as the likelihood of two randomly generated GUIDs being identical is very low.
  • Timestamps: Some GUIDs include a timestamp component, which is a combination of the current time and the unique identifier of the computer or network card generating the GUID. This helps ensure uniqueness, especially when GUIDs are generated at different times, or generated on different machines.

When high levels of uniqueness are required, additional measures, such as using GUIDs with timestamps or other unique elements, can be implemented.