A GUID, or globally unique identifier, is a 128-bit identifier used to identify objects, records, resources and other entities in software systems. GUID is commonly used as another name for a UUID.

Developer Generators

GUID Generator

Generate random GUID version 4 identifiers online for free. Create one or multiple GUIDs instantly with optional hyphens and uppercase or lowercase formatting.

GUID Generator

Choose how many GUIDs you need, select the output format, and generate your identifiers instantly.

Number of GUIDs Generate between 1 and 100 GUIDs.

Letter case

Include hyphens

Generated GUIDs 0 GUIDs

GUID version 4: This tool generates random GUID v4 identifiers using your browser's cryptographically secure random number generator when supported.

What Is a GUID Generator?

A GUID generator creates globally unique identifiers that can be used to identify records, objects, resources, transactions and other entities in software systems. A GUID is a 128-bit identifier commonly represented as hexadecimal characters in a standard text format.

This free GUID Generator creates random version 4 GUIDs directly in your browser. It can generate a single identifier or a batch of identifiers without requiring an account, software installation or server-side processing.

Why Use This GUID Generator?

This GUID generator provides a simple way to create random GUIDs for software development, databases, APIs, testing and other technical tasks.

Random GUID v4

Generate random GUID version 4 identifiers suitable for many common development and testing tasks.

Batch Generation

Create up to 100 GUIDs in one operation instead of generating identifiers individually.

Custom Formatting

Choose lowercase or uppercase hexadecimal characters and optionally remove the standard hyphens.

Browser-Based

Generate GUIDs directly in your web browser without installing a separate developer utility.

Easy to Copy

Copy all generated GUIDs to your clipboard with a single button for quick use in code and other applications.

Free to Use

Generate GUIDs online for free without registration, subscriptions or usage charges.

How to Use the GUID Generator

Generating GUIDs takes only a few seconds. Configure the output format and create the identifiers you need.

Choose the quantity — Enter the number of GUIDs to generate, from 1 to 100.
Select the letter case — Choose lowercase or uppercase hexadecimal characters.
Choose the format — Keep hyphens enabled for the standard GUID representation or disable them for a continuous 32-character hexadecimal value.
Generate and use your GUIDs — Click Generate GUIDs, then copy the results or download them as a text file.

Generate Random GUID Version 4 Identifiers

GUID version 4 is commonly used when an application needs randomly generated identifiers. A standard textual GUID contains 36 characters when hyphens are included, consisting of 32 hexadecimal characters and four hyphens. The hexadecimal representation is conventionally divided into groups of 8, 4, 4, 4 and 12 characters.

Random GUIDs are useful when an application needs identifiers that can be generated independently without relying on a central numbering service. Common uses include database identifiers, API resources, application objects, test records, distributed systems and development data.

GUID Format and Structure

A typical GUID v4 looks like xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the hexadecimal characters are generated randomly subject to the bits reserved for the GUID version and variant. The fourth group identifies the version as version 4, while the appropriate variant bits are also set.

GUIDs for Windows and Software Development

The term GUID is particularly common in Microsoft and Windows development, where globally unique identifiers are used in many APIs, software components, databases and development environments. GUIDs are also widely encountered in other programming contexts and are generally compatible in concept with UUIDs.

GUID Generator Information

This tool generates GUID version 4 values using cryptographically secure browser randomness through the Web Crypto API where available. GUID generation takes place locally in the browser, and the generated values are not submitted to a YesTools server by the generator itself.

GUIDs are designed to make accidental collisions extremely unlikely, but they should not be considered an absolute mathematical guarantee that two independently generated identifiers can never be identical. GUIDs should be used according to the requirements of the particular software system and should not automatically be treated as passwords, authentication credentials or encryption keys.

Created by

James William Steven Parker

Creator & Developer of YesTools

James William Steven Parker is a web developer and technology professional with extensive experience in web development, web design, SEO, web hosting, systems analysis and cybersecurity. He created YesTools to provide fast, practical and free online tools for everyday tasks and technical work.

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Frequently Asked Questions

What is a GUID?

A GUID, or globally unique identifier, is a 128-bit identifier used to identify information such as records, resources, objects and software components. GUID is also commonly used as another name for a UUID.

What type of GUID does this generator create?

This generator creates random GUID version 4 identifiers. GUID v4 uses randomly generated values while reserving specific bits to identify the GUID version and variant.

How many GUIDs can I generate at once?

You can generate between 1 and 100 GUIDs at a time. Each generated GUID is placed on its own line so batches can be copied or downloaded easily.

Are GUIDs and UUIDs the same thing?

GUID and UUID generally refer to the same 128-bit identifier concept. GUID is a term frequently associated with Microsoft and Windows development, while UUID is the more general term used across software systems.

Can I generate GUIDs without hyphens?

Yes. Disable the Include hyphens option before generating your GUIDs. The resulting identifiers contain 32 hexadecimal characters without separators.

Are GUIDs generated in my browser?

Yes. GUID generation is performed locally in your browser using the Web Crypto API when supported. The GUID values generated by this tool are not sent to a YesTools server by the generator.

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