What is a UUID?

A UUID (Universally Unique Identifier) — also known as a GUID — is a 128-bit identifier widely used in software to uniquely reference data without a central authority. Different versions use randomness, names, or timestamps to minimize collisions.

When to use each version

• v4 — Random identifiers suitable for general purpose use and testing.
• v5 — Name-based (SHA-1) identifiers that produce the same UUID for the same namespace and name.
• v7 — Time-ordered identifiers that sort chronologically, useful for databases and logs.

Why this generator?

• Bulk generation with copy, delete, and download options.
• Quick validation and search filtering.
• Presets, analytics, and local history for power users. All operations happen in your browser.

How to Use the UUID / GUID Generator

This free UUID Generator is designed to help developers, database administrators, and system testers quickly create unique identifiers for any purpose — right from the browser. Everything happens locally on your device for maximum privacy.

Step-by-Step Guide

1. Select UUID Version: Choose between v4 (random), v7 (time-based), or v5 (name-based). Each serves a unique use case depending on whether you need randomness, order, or reproducibility.
2. Set the Quantity: Enter how many UUIDs you want to generate at once — up to 500 at a time.
3. Adjust Options: Customize the output with uppercase letters, remove hyphens, or save results automatically to history. You can also add a prefix or suffix for labeling, such as user- or -session.
4. Generate and Manage: Click Generate to create your list instantly. Copy, delete, or download the UUIDs using the action buttons. Hover over a UUID to see the copy icon — it’s fast and responsive.
5. Save Presets: Use presets to store your preferred configuration for future sessions. These are saved in your browser and load instantly next time.
6. Share or Validate: Copy a sharable link to send your configuration to teammates, or use the built-in validator to check if a UUID is properly formatted.

Benefits of Using This UUID Generator

• 100% Client-Side: All UUIDs are generated locally — nothing is uploaded or stored on a server.
• Multiple Formats: Instantly copy as plain text, JSON array, JavaScript variable, or SQL insert list.
• Developer Friendly: The tool includes shareable presets, analytics, and configuration links for easy team use.
• Fast and Secure: Uses modern browser cryptography (Web Crypto API) to ensure high-quality randomness and predictable v5 hashing.
• Analytics and History: Get performance stats for each generation session and maintain a full local history of your past UUIDs.
• Responsive and Accessible: Works smoothly across desktop and mobile, with light/dark themes and keyboard-friendly controls.

When to Use UUIDs

UUIDs are widely used to uniquely identify data across systems without relying on centralized ID generators. Common use cases include:

• Assigning IDs to database rows, users, or API records.
• Generating transaction or session identifiers in distributed systems.
• Creating consistent resource IDs for cloud and IoT applications.
• Tagging files, images, or uploads without collisions.
• Developing test data or mock APIs for software development.

Best Practices for UUID Management

• Prefer UUID v7 when ordering or sorting IDs by creation time is important.
• Use UUID v5 if you need repeatable identifiers derived from a name or domain.
• Keep UUIDs lowercase in URLs and uppercase in display contexts for consistency.
• Store UUIDs as CHAR(36) or BINARY(16) in databases depending on performance and storage goals.
• Avoid trimming or altering the UUID structure — always validate before saving to production systems.

Why Developers Love This Tool

This generator combines functionality, speed, and a clean interface for both professionals and learners. You can work entirely offline, save presets for your workflow, and use analytics to track generation efficiency. Its fully client-side architecture makes it both private and blazing fast.

Whether you're preparing test data, developing APIs, or managing distributed systems, this tool ensures you always get reliable, unique identifiers — instantly and securely.