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UUID Generator

UUID Generator

Generate, manage, validate, and export universally unique identifiers in every format

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UUID Generator

Table of Contents

  1. Overview
  2. Key Features
  3. How to Use
  4. Frequently Asked Questions
  5. Privacy & Security

Overview

UUID Generator (UUID Studio Pro) is a comprehensive tool for creating and managing Universally Unique Identifiers directly in your browser. A UUID is a special 128-bit code formatted as 32 hexadecimal digits separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000) that is guaranteed to be unique across the entire world. Developers, database administrators, and IT professionals use UUIDs as primary keys, session identifiers, API request IDs, file names, and coordination tokens across distributed systems.

This tool supports 10 different identifier types: UUID v4 (random, the most common), UUID v1 (time-based), UUID v7 (sortable by time, ideal for database keys), UUID v3 (name-based with MD5), UUID v5 (name-based with SHA-1), UUID v6 (reordered time), ULID (user-friendly and sortable), Nil UUID (all zeros), Max UUID (all ones), and GUID (Microsoft uppercase format). You can generate single UUIDs or perform bulk generation of up to 1,000 at once.

Beyond generation, UUID Studio Pro provides a full management suite. The History panel tracks every UUID you save with notes, tags, and favorites. The Analytics dashboard visualizes your usage patterns with pie charts and timelines. The Import/Export system supports JSON, CSV, TXT, SQL, XML, and YAML formats. Additional tools include a UUID Validator to check if identifiers are properly formatted, a Converter to change formats, and a Parser to extract detailed version and timestamp information from any UUID. All processing happens locally in your browser with complete privacy.

Key Features

10 UUID/Identifier Types

Generate UUID v1, v3, v4, v5, v6, v7, ULID, Nil UUID, Max UUID, and GUID formats. Each type serves a different purpose, from random identifiers to time-sortable database keys.

Bulk Generation

Generate up to 1,000 UUIDs at once. Choose the type, set the count, and get all results instantly with options to copy all, copy individual, or save the entire batch to your history.

History & Organization

Every saved UUID is stored with its version, timestamp, personal notes, and tags. Search across all fields, mark favorites, organize into collections, and perform bulk operations on selected items.

Analytics Dashboard

Visualize your UUID usage with a version distribution pie chart, generation timeline graph, and summary statistics including total generated, storage used, and most-used version type.

Import & Export

Export your UUIDs in 6 formats: JSON, CSV, TXT, SQL, XML, and YAML. Import UUIDs by pasting text, uploading files, or dragging and dropping. Transfer data between devices easily.

Validator & Parser

Validate any UUID to confirm proper formatting and version compliance. The Parser extracts detailed information including version number, variant, and embedded timestamps from time-based UUIDs.

Format Converter

Convert UUIDs between different representations: standard lowercase, uppercase GUID format, with or without hyphens, URN format, and more. Ideal for matching system-specific requirements.

Keyboard Shortcuts

Power user shortcuts including Ctrl+G to generate, Ctrl+Z/Y for undo/redo, Ctrl+A to select all in history, and a Command Palette for quick access to any action in the app.

How to Use

  1. Open the Generator - Navigate to the UUID Generator in your browser. The Generator tab is selected by default. No installation, account, or internet connection is required after loading.
  2. Select a UUID Type - Choose from the dropdown menu: UUID v4 (random, recommended for most uses), UUID v1 (time-based), UUID v7 (sortable, best for databases), or any of the 10 supported types. For name-based types (v3, v5), enter a namespace and name value.
  3. Generate Your UUID - Click "Generate UUID" or press Ctrl+G. For quick generation without configuration, use the "Quick Generate" button in the top header to instantly create a UUID v4.
  4. Copy or Save the Result - Click the copy button to copy the UUID to your clipboard. Click "Save to History" to store it with optional notes and tags for future reference.
  5. Bulk Generate (Optional) - Scroll to the Bulk Generation section, enter a count (1-1,000), select the type, and click "Generate Bulk UUIDs" to create many identifiers at once with copy-all and save-all options.
  6. Manage Your History - Switch to the History tab to view, search, edit, favorite, tag, and organize all your saved UUIDs. Use bulk select mode to export or delete multiple items at once.
  7. Export Your Data - Go to the Import/Export tab, choose a format (JSON, CSV, TXT, SQL, XML, or YAML), and download your UUID collection for use in your projects, databases, or configuration files.

Frequently Asked Questions

Are the generated UUIDs truly unique?
Yes. UUID v4 uses cryptographically secure random number generation with a collision probability of approximately 1 in 5.3 trillion. For practical purposes, the chance of generating two identical UUID v4 values is essentially zero.
Which UUID version should I use?
UUID v4 (random) for most general-purpose cases. UUID v7 for database primary keys that need to be sortable by creation time. UUID v1 when you need to extract the creation timestamp later. UUID v3 or v5 when the same input must always produce the same UUID. ULID when humans need to read or type the identifier.
Do I need an internet connection?
No. Once the app has loaded in your browser, it works completely offline. All UUID generation, validation, conversion, and data management happen locally on your device.
Where is my data stored?
All data is stored in your browser's localStorage on your computer. It never leaves your device. No UUIDs, history, notes, or tags are transmitted to any server.
How many UUIDs can I store?
Storage is limited by your browser's localStorage capacity, which is typically 5-10MB. This allows approximately 10,000 to 50,000 UUIDs with notes and tags. You can export and clear old data to free up space.
What is the difference between UUID and GUID?
They are functionally the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. The main formatting difference is that GUIDs are typically written in uppercase letters while standard UUIDs use lowercase.
Can I use generated UUIDs in my commercial project?
Yes. UUIDs are an open standard (RFC 4122) with no licensing restrictions. You are free to use any UUID generated by this tool in personal, open source, or commercial projects without limitation.
What is a ULID and when should I use it?
A ULID (Universally Unique Lexicographically Sortable Identifier) is similar to a UUID but uses a more human-readable encoding and sorts chronologically. Use ULIDs for user-facing identifiers, API keys, or any context where readability and sortability matter.
Can I use this on multiple devices?
Yes, but data does not automatically sync between devices. To transfer your UUID history, use the Export function on one device to download a file (JSON, CSV, etc.), then use the Import function on the other device to load that file.
Are UUID v4 values really random?
Yes. The app uses the Web Crypto API for cryptographically secure random number generation. The results are suitable for security-sensitive applications, not just casual use.
Is there a mobile app?
There is no separate native app, but the web application is fully responsive and works well on mobile browsers. The interface adapts to smaller screens with a collapsible sidebar navigation.
How do I validate an existing UUID?
Navigate to the Validator tab in the sidebar, paste any UUID into the input field, and the tool will instantly tell you whether it is a valid UUID, which version it is, and provide detailed breakdown information.

Privacy & Security

Your Data Never Leaves Your Device

UUID Generator operates entirely within your web browser. All UUID generation uses local cryptographic random number generators. Your history, notes, tags, collections, analytics data, and settings are stored exclusively in your browser's localStorage. No UUIDs, usage patterns, or personal information are ever transmitted to any server. You maintain full control over your data with the ability to export everything locally or clear it at any time. The app requires no account, no login, and no personal information.

Ready to try UUID Generator? It's free, private, and runs entirely in your browser.

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Related

Blog: Guide to UUID v1, v4, and v7

Learn when to use each UUID version, how they differ internally, and best practices for database keys and distributed systems.

Epoch Converter

Convert Unix timestamps to human-readable dates and vice versa. Essential companion tool for working with time-based UUIDs.
Milan Salvi

Milan Salvi

Founder, Leena Software Solutions

Milan is the founder of ZeroDataUpload and Leena Software Solutions, building privacy-first browser tools that process everything client-side. View all articles · About the author.

Last Updated: February 28, 2026