UUID Generator
Generate cryptographically random v4 UUIDs. Everything runs locally in your browser.
How to Use UUID Generator
Generate v4 UUIDs instantly in your browser. Create multiple UUIDs at once, customize format, and copy with one click. 100% client-side.
Type directly into the input field, paste from your clipboard, or upload a file. The tool accepts a wide range of inputs and handles edge cases automatically.
Click the action button or watch as the tool processes your input in real time. All computation happens locally in your browser - nothing is sent to any server.
Copy the output to your clipboard with one click, or download it as a file. Your data stays private throughout the entire process.
Why Choose PrivConvert?
Unlike other online tools that upload your files to remote servers, store them for days, and may use them for AI training or data mining, PrivConvert was built with privacy as the foundation.
Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.
All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.
Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.
Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.
Trusted by Thousands of Users
PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.
Frequently Asked Questions
Is UUID Generator free to use?
Yes, completely free with no limits, no sign-up, and no hidden fees. Use it as many times as you want.
Is my data safe?
All processing happens directly in your browser. Your data is never sent to any server, never stored, and never shared. It's 100% client-side.
Does it work on mobile devices?
Yes. The tool works on any device with a modern web browser - smartphones, tablets, laptops, and desktops.
Do I need to create an account?
No. You can use the tool instantly without signing up, providing an email, or creating any profile.
Which UUID version this makes, and why
This generates version 4 UUIDs — the random kind. Of the 128 bits, 6 are fixed to mark the version and variant, leaving 122 bits of randomness. That is a large enough space that you can generate them independently on thousands of machines and never coordinate, which is the whole point of the format.
The values come from crypto.randomUUID(), the browser's built-in
generator, which is required by specification to use a cryptographically secure
random source. It is not a hand-rolled string built from Math.random(),
a pattern still copied around from old answers online and one that produces
UUIDs which can collide and can sometimes be predicted.
The other versions, briefly
- v1 encodes a timestamp and the machine's MAC address. It sorts by creation time, which databases like, but it leaks where and when it was made.
- v4 is pure randomness. No information leaks, but it does not sort, which can fragment a B-tree index.
- v7 is the modern compromise: a timestamp prefix followed by randomness, so it sorts chronologically without exposing hardware.
If you are choosing a primary key format for a new table with high insert volume, v7 is worth reading about. For everything else — correlation IDs, idempotency keys, filenames, test fixtures — v4 is the right default and is what almost everyone means when they say UUID.
Are collisions a real risk?
No, at any scale you will encounter. To reach a one in a billion chance of a single collision you would need to generate on the order of a hundred billion v4 UUIDs. Duplicate UUIDs in practice come from bugs — a weak random source, a value reused across environments, a fixture copy-pasted — never from exhausting the space.