GUID Generator Tool – Create Unique Identifiers Online

GUIDs are essential for ensuring unique identifiers in software development, database management, and application programming. Our tool provides a quick and secure way to generate them. Create random, unique identifiers in UUID format for any application or project.

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What is a GUID?

A GUID (Globally Unique Identifier) is a 128-bit identifier used in software applications to uniquely distinguish objects, records, or entities across systems and networks. It ensures that every generated ID is unique worldwide, preventing duplication and conflicts in databases, distributed systems, and APIs.

GUIDs are commonly represented as 32 hexadecimal digits displayed in five groups separated by hyphens, such as 550e8400-e29b-41d4-a716-446655440000. The most widely used version is GUID version 4, which generates random values with an extremely low chance of collision.

Developers rely on GUIDs for tasks like database keys, session identifiers, and unique resource naming because they guarantee uniqueness without requiring a central authority. This makes GUIDs essential for modern software architecture, especially in distributed and cloud-based environments.

GUID (UUID) Generation Examples

Below you can find code examples in the three most common programming languages: C#, JavaScript, and Python for generating GUIDs (also known as UUIDs). Feel free to copy and use them in your own projects quickly and easily.

Generate GUID in C#


// Generate GUID
Guid newGuid = Guid.NewGuid();
Console.WriteLine("New GUID: " + newGuid.ToString());

Generate UUID in JavaScript


// Generate a random UUID (v4)
function generateUUID() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        const r = Math.random() * 16 | 0;
        const v = c === 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

const uuid = generateUUID();
console.log("New UUID:", uuid);

Generate UUID in Python


import uuid

# Generate UUID (version 4)
new_uuid = uuid.uuid4()
print("New UUID:", new_uuid)

Frequently Asked Questions

A GUID (Globally Unique Identifier), also known as UUID (Universally Unique Identifier), is a 128-bit value used to uniquely identify information. It is commonly used for database records, session IDs, API keys, and more where uniqueness is critical.

GUID (or UUID) is defined by the RFC 4122 standard. This specification is published by the IETF (Internet Engineering Task Force) and explains how globally unique identifiers are generated. The most commonly used version is UUID v4, which is randomly generated.

UUID version 4 is generated using random numbers, and the chance of a collision is extremely low (1 in 2122). While not guaranteed to be unique, the probability is negligible for most practical use cases.

Simply click the "Copy" button in the top-right corner of each code block to copy the code to your clipboard instantly.