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01Developer toolFormatted output
UUID Generator
Random v4 UUIDs, as many as you need.
100% FreeRuns instantlyNo watermark
- 1Paste inputAdd the text, code or data.
- 2AdjustChoose formatting or generation options.
- 3RunProcess everything in the browser.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use UUID Generator
Choose formatting or generation options.
02Process everything in the browser.
03Copy or download the clean result.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyWhen two systems need to create identifiers without asking each other first, random UUIDs are the standard answer — the odds of a collision are small enough to design around.
What UUID Generator does
Generates version 4 UUIDs — 128-bit identifiers built from random data — up to 500 at a time.
Version 4 is the random one, which is what nearly everybody means by UUID. It contains no timestamp and no machine identifier, so it leaks nothing about where or when it was created.
Format and properties
| Version | 4 — random |
|---|---|
| How many at once | 1–500, default 5 |
| Format | 8-4-4-4-12 hexadecimal characters, hyphen-separated |
| Example shape | f47ac10b-58cc-4372-a567-0e02b2c3d479 |
| Random bits | 122 of the 128 — the rest encode version and variant |
| Contains | Nothing about time, machine or sequence |
| Randomness source | The browser’s cryptographic random generator |
Detailed steps
- Set how many you need.
- Generate.
- Copy them all at once.
Worth knowing
UUIDs make poor primary keys in a large database, and this catches teams out. Being random, consecutive inserts land all over the index rather than at the end, which fragments it and slows writes. Plenty of systems use a UUID as the public identifier and a plain sequential integer as the internal key.
Frequently Asked Questions
Can two UUIDs ever be the same?
In theory yes, in practice no. With 122 random bits you would need to generate billions per second for a century before a collision became likely. Every serious system treats v4 UUIDs as unique.
Which version is this, and does it matter?
Version 4, the random one — the 4 in the third group tells you. Version 1 embeds a timestamp and MAC address, which leaks information; v4 leaks nothing, which is why it is the usual choice.
Are these safe to use as security tokens?
They are generated from the browser’s cryptographic random source, so they are unpredictable. Even so, a session token should be purpose-built rather than a repurposed identifier — a UUID is designed to be unique, not secret.
Why the hyphens?
Convention, from the 8-4-4-4-12 grouping in the specification. They carry no information and many systems store the 32 hex characters without them.
Is UUID Generator free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. UUID Generator runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. UUID Generator works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.