Online GUID/UUID Generator

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Free & Online GUID Generator Tool allows you to generate the individual or bulk sets of Globally Unique Identifiers (GUIDs) within no time.

What is a GUID?

GUID is an acronym of Globally Unique Identifier, also known as a Universally Unique Identifier (UUID). A 128 bits unique reference number used in computer systems. UUID is generally used globally, except for Microsoft technologies, where the term GUID is typically used by the developers working in and the software created by them.

Structure of the GUID

The GUID comes in a few different versions and variants. But follow the structure defined by RFC 4122.

The GUID structure looks like this.



  • M = the version
  • N = the variant

Usage of GUIDs

The GUIDs or UUIDs are two terms, but they are synonymous. And used

  • To set a unique primary key in databases. That allows database items to be merged without any conflict.
  • To set the unique file name for uploading or uploaded files.
  • To set the unique name for the resources created by Microsoft technologies.
  • To develop and register the unique IDs for different resources without contacting the central authority. It is easy to dish out but hard to track.
  • To set the unique IDs for the products.
  • To set the unique IDs for design files or models.

Types of GUIDs

The general types of GUIDs are

  • Random: use the system to generate a random number of 128 bits.
  • Time-based: generate the GUID based on the current time.
  • Hardware-based: GUID's certain parts are based on hardware features, although this removes the number's anonymity. Such as the MAC address of a network card.
  • Content-based: generate the GUID based on the hash of the file contents. Files with the same content have the same GUID. So that is used when you want to assign the same GUID for duplicate files.

How unique is a GUID?

GUIDs (UUIDs) are generated under specific standards and are unique. Even though there is no central registration authority or coordination between the parties developing them. However, the probability of duplication is not zero. It is close to zero and negligible.

For example, if there are 1,000,000,000 GUIDs generated for one second for a year, duplication chances are 50 percent. Or even if every human on Earth generates 600,000,000 GUIDs, duplication chances are still 50 percent.

The research shows 7.5 x 1018 grains of sand on Earth, but they are nothing compared with the number of GUIDs (UUIDs) available. That is 2128 distinct GUIDs – much more than stars in the known universe.

So, anyone can generate and use the GUIDs (UUIDs) by following the standards and structure provided by RFC 4122 without any fear of duplication.

Note: Even though the chances of duplication in GUIDs (UUIDs) is near to zero. But still, the information labeled with GUIDs (UUIDs), and generated by independent parties, can be combined under one centralized database to safe from any duplication.

How to generate Globally Unique Identifiers (GUIDs)?

Anyone can generate and use the GUIDs (UUIDs), and several online tools are there that help you develop the GUIDs. To generate the GUID, perform the following steps.

  • Open the Free & Online GUID Generator Tool.
  • Select the number of GUIDs; you want to generate.
  • Choose your configuration. The tool allows you to select among
    • Hyphens
    • UpperCase
    • {} Braces
    • Base64 encode
    • URL encode
  • Select the configuration according to your need. You can select all configurations, among any of them or none of them.
  • Click on the "Generate GUID" button.
  • The tool will generate the results, as per your mentioned "number of GUIDs" and selected "configuration(s)."
  • Please copy the results GUID(s) and paste them to the desired location for further use.

Note: We do not keep a copy of the resulted GUID(s). Therefore, please copy the GUID(s) and paste it to the desired location for future use if you are happy and satisfied with the results.