UUID Generator: free online, fast and secure
UUIDs are 128-bit identifiers that are practically guaranteed to be unique, used as database keys, order IDs, file names and API tokens. This generator creates version 4 UUIDs using your browser’s cryptographically secure random generator.
Generate one or up to 1,000 at once and format them as uppercase, without hyphens or with braces for Windows GUID style.
How to use UUID Generator
- Choose how many. From 1 to 1,000.
- Pick format. Uppercase, no hyphens or braces.
- Copy or download. Use them in your code or database.
Why use ConvertKaro UUID Generator? Free, fast and secure
Here is what makes this UUID Generator tool different from most websites.
100% Free
Every feature of this tool is free for everyone. We do not lock better quality or bigger files behind a paid plan.
Fast results
Your file is processed right inside your browser, so there is no upload or download queue. Most jobs finish in a second or two, even on a slow mobile connection.
Secure and private
Privacy is built in: the conversion runs locally with JavaScript, so your data is never sent to us or anyone else. Close the tab and everything is gone.
No signup, no watermark
No registration and no watermark, ever. What you download is exactly your file.
Works on every device
Works in Chrome, Safari, Edge and Firefox on Android, iPhone, Windows, Mac and Linux. No app to install.
Cryptographically secure
Uses crypto.randomUUID, so IDs are unpredictable.
ConvertKaro vs other websites and apps
| ConvertKaro | Typical website or app | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your data | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
Common uses for UUID Generator
- Database primary keys
- Test and seed data
- Unique file and upload names
- Order and transaction IDs
- Device and session identifiers
Tips for the best results
- UUID v4 has 122 random bits; collisions are practically impossible.
- Store UUIDs as native UUID types in Postgres for efficiency.
- Remove hyphens for compact URLs.
- Hash data with the Hash Generator.
Good to know
Small utilities like UUID Generator save time every day: no need to open an IDE, install a package or write a script for a quick check. The tool follows the same standards used by browsers and Node.js, so results match what your code will do. Bookmark this page or add it to your home screen to keep it one click away.
| Price | Free, no limits |
|---|---|
| Processing | In your browser, instant |
| Signup | Not required |
| Watermark | None |
| Works on | Android, iPhone, Windows, Mac, Linux |
| Category | Developer tools |
How UUID Generator keeps your code and data private
Everything you enter into UUID Generator stays on your device. The tool works offline once the page has loaded, because all the logic is in the page itself rather than on a server. We never receive, log or store your code and data, so you can use it at work, at school or for personal matters without worrying about privacy.
Using UUID Generator on your phone
On a phone, open this page in Chrome or Safari, tap the main button and pick or paste what you need. Results download straight to your phone, usually into the Downloads folder or Files app. You can also add this page to your home screen for one-tap access next time.
Who uses UUID Generator?
UUID Generator is used every day by people from many backgrounds, for example:
- Web developers and programmers
- Students learning coding and web design
- Digital marketers and SEO specialists
- Testers and support engineers debugging data
- Small business owners managing their own websites
Supported input: Plain text, JSON, CSS, JavaScript, HTML, URLs, Base64, tokens and image files where relevant.
Frequently asked questions
What is a UUID v4?
A randomly generated 128-bit identifier written as 36 characters with hyphens.
Is a GUID the same as a UUID?
Yes. GUID is Microsoft’s name for the same standard.
Can two UUIDs be the same?
The chance is so small it is ignored in practice.
Is UUID Generator really free?
Yes, completely free. You can use it as many times as you want, and every option on the page is included at no cost.
Is it safe to use UUID Generator online?
Yes. Your data are processed inside your own browser and are never uploaded to our servers, so nobody else can see them.
Does UUID Generator work on mobile?
Yes, the tool is built mobile-first. Open this page on your phone, add your data and download the result directly.
Do I need to install anything to use UUID Generator?
No. UUID Generator works in your web browser. There is no app, plug-in or extension to install.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Copy or download the result as it is.
Does UUID Generator work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.
Related free tools
You may also find these tools useful: Password Generator, Hash Generator, Unix Timestamp Converter, JSON Formatter, Base64 Encode Decode.