UUID Generator
FreeGenerate RFC-4122 UUIDs v1/v4 instantly
About UUID Generator
When you need a unique identifier for a database row, a message key, or a distributed system, reaching for a UUID is the standard move, but pulling one up shouldn't require a code snippet or a REPL. This generator produces RFC-4122 UUIDs on demand, including version 1 and version 4, so you have a valid ID ready to copy in seconds.
Version 4 UUIDs are random, ideal for general-purpose unique keys, while version 1 encodes a timestamp and node identifier. Pick the version, generate, and copy. It works instantly in your browser, is completely free, requires no account, and adds nothing to the value beyond the UUID itself.
Common uses
- Generate a v4 UUID to use as a primary key or external reference ID
- Create unique identifiers for test fixtures, seed data, or mock records
- Produce a correlation or request ID while debugging a distributed service
- Grab a v1 timestamp-based UUID when you need time-ordered identifiers
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Instant generation
- Copy-ready output
- No login required
FAQ
What's the difference between v1 and v4?
v4 UUIDs are randomly generated, while v1 UUIDs are based on a timestamp and node identifier. v4 is the most common choice for general uniqueness.
Are these RFC-4122 compliant?
Yes. The generated UUIDs follow the RFC-4122 format and structure for the version you select.
Can I generate several at once?
You can generate UUIDs on demand and copy each one, making it easy to grab multiple identifiers in a row.
Can I use UUID Generator on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.