UUID/GUID Generator
Generate one or many random version-4 UUIDs (also called GUIDs) for use as database keys, API identifiers, or test data.
How to Use the UUID/GUID Generator
- Set the quantity you need (1 to 100 at a time).
- Optionally check "Uppercase" to get uppercase hex letters, or "No hyphens" for a plain 32-character string.
- Click "Generate" to create fresh random UUIDs.
- Click "Copy All" to copy every generated UUID to your clipboard, one per line.
Why Use This Tool?
Is my data uploaded anywhere?
No generation of any kind touches a server. UUIDs are created locally using your browser's built-in crypto.randomUUID() function (or a manual RFC 4122-compliant fallback using crypto.getRandomValues on older browsers), so nothing about your session is ever transmitted or logged.
What is a UUID v4, and how random is it really?
A version-4 UUID is a 128-bit identifier where all bits except a few fixed version/variant bits are randomly generated, giving an astronomically low chance of collision even across trillions of generated IDs. Because this tool uses the cryptographically secure crypto API rather than Math.random(), the output is suitable for real application use, not just demos.
What's the difference between a UUID and a GUID?
They're effectively the same thing — GUID (Globally Unique Identifier) is Microsoft's term for the same 128-bit identifier format standardized as UUID (Universally Unique Identifier) in RFC 4122. Any UUID generated here works equally well wherever a GUID is expected, such as in .NET or SQL Server systems.
Who uses a UUID generator?
Backend developers seeding test databases, engineers assigning unique keys to distributed records without a central counter, and QA teams generating bulk unique test identifiers all rely on a fast, reliable UUID generator that can produce many values at once.