What is a UUID v4?
A UUID (or GUID) is a 128-bit identifier that is virtually guaranteed to be unique. Version 4 UUIDs are generated using random numbers, and this tool uses your browser’s cryptographically secure random generator.
UUID Generator
Generate any number of random v4 UUIDs, with optional uppercase or no-hyphen formatting.
How it works
- 1
Set the options (length, mode, character types, etc.).
- 2
Click the generate / create button.
- 3
Copy the result. Generate again for a new value.
Why use this tool
- Runs entirely in your browser — nothing is uploaded to a server.
- 100% free, no sign-up, no limits.
- Works in any modern browser — no app install, no extension, no account.
How to use UUID Generator
Configure the options in UUID Generator, then click generate. Each click produces a new value in your browser — copy what you need.
Tips for better results
Review options before generating. Click again if you need another candidate. Prefer copying instead of screenshotting secrets.
Privacy and offline-friendly processing
Whenever possible, UUID Generator processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
Frequently asked questions
How unique are these UUIDs?
The probability of a collision is astronomically low — practically zero for any real-world use case.
Can I generate UUIDs without hyphens?
Yes, uncheck the hyphens option to get a plain 32-character hex string.
Is my data uploaded when I use this tool?
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Is UUID Generator free to use?
Yes. UUID Generator is free, with no sign-up and no artificial usage caps for normal personal and work use.
Does UUID Generator work on mobile?
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.