UUID Generator — Free Online Tool
Generate random UUIDs in bulk instantly
How to use this tool
- [01]Choose UUID version 4 (random) or version 1 (timestamp-based).
- [02]Set how many UUIDs you need — a single value or up to 100 at once.
- [03]Copy an individual UUID or use bulk copy to grab the entire generated list.
About this UUID Generator
The UUID Generator produces version 4 (random) and version 1 (timestamp-based) UUIDs — 128-bit identifiers formatted as the standard 32-character hyphenated string — using the browser's cryptographically secure random number generator for v4, so the output has the same collision-resistance guarantees as UUIDs generated by any production system. You can generate a single UUID or up to 100 at once for seeding test data or populating a database migration.
Version 4 UUIDs are almost entirely random, which is why they're the default choice for most applications: no coordination between systems is needed to guarantee two generated UUIDs won't collide, unlike auto-incrementing integer IDs which require a single source of truth. Version 1 UUIDs embed a timestamp and (historically) a MAC-address-derived component, which makes them sortable by creation time but reveals more information about when and where they were generated — a tradeoff worth knowing before choosing v1 over v4 for anything user-facing.
Typical uses include generating primary keys for a new database schema, creating unique identifiers for test fixtures or mock API responses, and generating session or request IDs during development before a backend is wired up to do it automatically.
Generation happens entirely in your browser using the Web Crypto API; no generated values are logged or stored.
Our UUID Generator is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.
Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.
Frequently asked questions
Is the UUID Generator completely free?
Yes, the UUID Generator is 100% free to use with no hidden charges, no subscription, and no signup required. Simply visit the page and start using it immediately.
Does this tool upload my files to a server?
No. Everything runs entirely in your browser using JavaScript. Your files, text, and data never leave your device and are never sent to our servers. This makes it completely private and secure.
Does the UUID Generator work on mobile?
Yes, the UUID Generator is fully responsive and works on all devices including smartphones, tablets, and desktop computers. It works on Chrome, Firefox, Safari, and Edge browsers.
How accurate is this tool?
Our UUID Generator uses industry-standard algorithms to ensure accurate results every time. It has been tested extensively across different browsers and devices to ensure consistent and reliable output.
Should I use v4 or v1 UUIDs?
Use v4 for almost any modern use case — it’s purely random, requires no coordination between systems, and doesn’t leak timing information. Use v1 only if you specifically need IDs that sort by creation time.
Are these UUIDs guaranteed to be unique?
Practically, yes — v4 UUIDs have 122 random bits, making collisions astronomically unlikely even across billions of generated values, which is why they’re used as primary keys in production systems without a central coordinator.
Related tools
Need a custom tool built for your business?
CodexStudio builds custom web applications, dashboards, and tools for businesses in Islamabad and worldwide. Get a free consultation today.