GUID - UUID Generator

Web-based GUID and UUID generator interface showing input options and generated UUID output in a clean, developer-friendly layout

Professional GUID / UUID Generator — generate RFC4122 v4 UUIDs, format, encode (Base64 / RFC7515 / URL), copy and download. Accessible, responsive, client-side tool. A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify data in distributed systems. GUID is a Microsoft synonym for UUID. This tool generates random UUID version 4 (v4) values which are widely used for database keys, tokens, filenames, identifiers, and more.

Generate RFC4122 v4 GUIDs client-side — format, encode and copy instantly.

Controls

Enter integer between 1 and 1000. Real-time validation enabled.
Formatting
Encoding

Result

Use the controls to copy, format results. Output area color indicates success or validation state.
Sample GUIDs are prefilled on load for quick testing. The generator uses random v4 algorithm per RFC 4122.

What is a GUID / UUID?

A GUID (Globally Unique Identifier) or UUID (Universally Unique Identifier) is a 128-bit unique value used to identify information in computer systems. These identifiers are designed to be unique across time and space, meaning the probability of generating the same value twice is extremely low.

A standard UUID is represented as a 36-character string consisting of hexadecimal digits, divided into five groups separated by hyphens, such as: 550e8400-e29b-41d4-a716-446655440000.

UUIDs are commonly used in databases, APIs, distributed systems, and software applications where unique identification is required without relying on centralized servers.

Why GUIDs and UUIDs Are Important

In modern software systems, especially distributed and cloud-based applications, creating unique identifiers without conflicts is critical. UUIDs solve this problem by allowing systems to generate unique IDs independently.

  • Prevent ID collisions in distributed databases
  • Ensure unique session identifiers in web applications
  • Safely identify API requests and transactions
  • Create unique filenames and resource identifiers
  • Improve scalability by removing centralized ID generation

Common Use Cases of UUIDs

UUIDs are widely used across multiple industries and technologies. Some common real-world use cases include:

  • Databases: Used as primary keys to uniquely identify records.
  • Web Development: Session IDs, CSRF tokens, and request identifiers.
  • APIs: Tracking requests and correlating logs.
  • Microservices: Unique message identifiers in distributed systems.
  • File Systems: Generating unique file names to avoid overwriting.

UUID Versions Explained

UUIDs come in different versions, each designed for specific purposes:

  • Version 1 (Time-based): Uses timestamp and MAC address. Useful for ordered UUIDs but may expose hardware information.
  • Version 4 (Random): Randomly generated and the most commonly used version for web applications.
  • Version 5 (Namespace-based): Generated using SHA-1 hashing with a namespace and name.

For most developers and general-purpose applications, UUID v4 is recommended due to its simplicity and extremely low collision probability.

How to Use This GUID / UUID Generator

This online GUID / UUID Generator allows you to instantly generate unique identifiers without installing any software. Follow these simple steps:

  1. Select the UUID version or format if available.
  2. Click the generate button.
  3. Copy the generated UUID and use it in your application.

All UUIDs are generated directly in your browser. No data is sent to any server, ensuring complete privacy and security.

Programming Examples

Below are examples of generating UUIDs in popular programming languages:

 JavaScript crypto.randomUUID(); Python import uuid uuid.uuid4() C# Guid.NewGuid();

Is UUID Truly Unique?

While it is theoretically possible for two UUIDs to collide, the probability is so small that it is considered practically impossible. For example, generating billions of UUID v4 values would still result in an astronomically low chance of duplication.

This makes UUIDs ideal for large-scale systems where uniqueness is critical.

Privacy and Security

This GUID / UUID Generator runs entirely in your browser using client-side JavaScript. No generated values are stored, logged, or transmitted to any server.

You can safely use this tool for personal, educational, and production purposes.

Frequently Asked Questions (FAQ)

What is the difference between GUID and UUID?

GUID and UUID are essentially the same concept. GUID is a term commonly used by Microsoft, while UUID is the standardized term defined by RFC 4122.

Can I use these UUIDs in production systems?

Yes, UUIDs generated by this tool are suitable for production use in databases, APIs, and distributed systems.

Do UUIDs impact database performance?

Random UUIDs may impact indexing performance in some databases. In such cases, ordered or time-based UUIDs may be preferable.

Is this tool free to use?

Yes, this GUID / UUID Generator is completely free and does not require registration.

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