UUID Generator

For practical purposes, yes. A version-4 UUID has 122 random bits, giving about 5.3 × 10³⁶ possibilities. You would need to generate a billion per second for roughly 85 years before a collision became likely. They are generated with your browser’s cryptographic random source, not a predictable pseudo-random one.

It depends on the trade-off you want. UUIDs let you create records without a round trip to the database and merge data across systems without conflicts. The cost is index performance: random values scatter writes across the B-tree. If that matters at your scale, look at UUIDv7 or ULID, which sort by time.

Only presentation — the underlying value is identical. Uppercase suits systems that expect it, braces match the Microsoft GUID convention seen in .NET and the Windows registry, and stripping dashes gives a compact 32-character string useful in URLs. Pick whichever your target system expects.

Yes, UUID Generator is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.

UUID Generator runs entirely in your browser. Your file is never uploaded — it is read, processed and saved locally, so it never reaches our servers or anyone else's. You can disconnect from the internet after the page loads and it still works.