Skip to main content
FileForge

UUID Generator

Generate version-4 UUIDs using your browser's cryptographic random source. Create one or a batch, with uppercase and hyphen-free formatting options.

Runs in your browser — files never leave your device

Free · No sign-upOutputs UUID v4
Loading tool…

How to use UUID Generator

  1. Choose how many UUIDs you need.

  2. Toggle uppercase or hyphen removal if your system requires it.

  3. Click Generate.

  4. Copy one UUID or the whole list.

About this tool

UUID v4 identifiers are 128-bit values with 122 random bits — enough that collisions are not a practical concern, which is why they're the default choice for database keys, request IDs and file names. Generation uses the Web Crypto API (crypto.randomUUID / getRandomValues), the same quality of randomness your backend would use, and happens on your device: the IDs you generate are never known to anyone else.

This is a quick way to grab test data or placeholder identifiers while developing — seeding a database with sample records, generating mock request IDs for a test suite, or creating unique file names for a batch upload script.

Common ways people use this

  • Generating sample primary keys or IDs for test or seed data in a database
  • Creating unique file names for a batch of uploaded files
  • Producing mock request or transaction IDs for testing an API integration

Tips for better results

  • Generate a batch of several hundred at once if you're seeding test data — it's faster than generating one at a time.
  • Use the no-hyphen option if the system you're pasting into expects a plain 32-character hex string rather than the standard hyphenated format.

Frequently asked questions

Can two generated UUIDs collide?
The probability is astronomically small — you would need to generate about 2.7×10^18 UUIDs for even a 50% chance of one collision. Treat v4 UUIDs as unique.
What's the difference between UUID and GUID?
Nothing practical — GUID is Microsoft's name for the same 128-bit identifier format.
Are these UUIDs predictable?
No. They come from the browser's cryptographic random generator, not a seeded pseudo-random function, and they never leave your machine.
How many UUIDs can I generate at once?
Up to 500 in a single batch, each independently random and ready to copy as a list.
Can I use these as database primary keys?
Yes, UUID v4 is a common choice for primary keys, especially in distributed systems where IDs need to be generated independently without a central counter.

Related tools

Other tools people commonly use alongside this one.

Password Generator

Create strong random passwords with control over length, symbols, digits and ambiguous characters. Generated locally with cryptographic randomness — never transmitted.

Developer

QR Code Generator

Create a QR code from any text or URL and download it as PNG or scalable SVG. No watermark, no expiry — the code is generated in your browser.

Developer

Base64 Text

Convert text to Base64 and back. Unlike naive implementations, this handles UTF-8 correctly, so emoji and non-Latin text round-trip safely.

Developer