UUID Generator

UUID Generator – Generate Random UUID v4 Online

Looking for a simple and efficient way to generate secure, random UUIDs (Universally Unique Identifiers)? Our free UUID Generator helps developers, engineers, and database administrators instantly create UUID v4 strings for use in a wide range of applications, from web and mobile development to distributed systems and databases.

What Is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value designed to be globally unique across time and space.

It's often represented as a 36-character string (including hyphens), such as

123e4567-e89b-12d3-a456-426614174000

UUIDs are commonly used for identifying objects, records, sessions, users, and transactions without revealing any sensitive or sequential information.

There are several UUID versions, but UUID version 4 (UUIDv4) is the most widely used because it is entirely random and suitable for most non-cryptographic use cases.

UUID v4 – Random but Reliable

UUID v4 relies on random number generation to ensure uniqueness. Unlike sequential IDs or time-based identifiers, UUID v4 avoids predictability, which is especially useful in systems where security, concurrency, or data privacy is important. Generated locally in your browser using secure JavaScript, each UUID v4 string produced by this tool is unique and ready for production environments.

How to Use the Online UUID Generator

Our tool is designed for instant use, no registration or installation required:

1. Click the “Generate” button at the top of the page.
2. The tool instantly creates a new UUID v4 string in the standard 8-4-4-4-12 format.
3. Copy the generated UUID and paste it into your codebase, application, or configuration file.

Features of Our UUID Generator Tool

• Free & Unlimited: Generate as many UUIDs as you need without limits.
• UUID v4 Compliant: All identifiers conform to RFC 4122 standards.
• Browser-Based: All UUIDs are generated client-side no server calls or data logging.
• No Sign-Up: Use instantly without creating an account or installing software.
• Developer-Friendly: Suitable for use in APIs, databases, mobile apps, cloud functions, and more.

Where Are UUIDs Used?

UUIDs are used across various fields and technologies to guarantee uniqueness without relying on a centralized system. Common use cases include:

• Assigning unique identifiers to records in databases (PostgreSQL, MySQL, MongoDB, etc.)
• Generating session IDs or user IDs in web or mobile applications
• Managing identifiers across distributed systems where central coordination is not possible
• Creating safe and unique filenames or tokens for temporary data
• Identifying resources in REST APIs and microservices

UUID in Programming Languages

Here’s how UUIDs are typically used across popular languages and platforms:

• JavaScript: Use libraries like uuid or crypto.randomUUID() to create UUID v4.
• Python: Use Python’s built-in uuid.uuid4() from the uuid module.
• Java: Generate UUIDs using UUID.randomUUID() from java.util.
• PostgreSQL: Use the uuid-ossp extension to generate UUIDs in SQL queries.
• Node.js: Install the uuid package for fast, compliant UUID generation.

FAQs – UUID Generator

Is this UUID generator secure?

Yes. All UUIDs are generated using secure, modern JavaScript libraries in your own browser. Your data is never sent to a server, making the process safe and private.

What is the format of a UUID v4?

A UUID v4 follows the 8-4-4-4-12 format (36 characters including hyphens) and looks like this: f47ac10b-58cc-4372-a567-0e02b2c3d479. It contains hexadecimal digits and is randomly generated.

Can I use these UUIDs in my application?

Yes, UUIDs generated here are fully valid and ready for use in any modern application, database, script, or API.

Does this tool support UUID versions other than v4?

Currently, this tool supports UUID version 4 only, which is sufficient for most general-purpose applications. If you need other UUID versions (v1, v5, etc.), consider using programming libraries that support them.

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