UUID Generator
About UUID Generator
Our free UUID Generator creates cryptographically random version-4 UUIDs (also called GUIDs) instantly, in bulk if needed, with optional uppercase formatting and hyphen removal - handy for database keys, testing, and unique identifiers in code.
Generate a single UUID or dozens at once, copy them all with one click, and format them exactly how your codebase expects (lowercase with hyphens, uppercase, or no hyphens at all) - a quick alternative to writing a script just to generate test IDs.
How to Use the UUID Generator
- Choose how many UUIDs you need - a single one or a bulk batch.
- Toggle uppercase formatting on or off depending on your codebase's convention.
- Toggle hyphen removal if your system expects a compact 32-character string instead of the standard hyphenated format.
- Click generate to produce the list instantly.
- Copy a single value or the entire batch with one click.
Who uses this tool: Backend developers use it to seed test data with realistic primary keys before a database migration, QA engineers use bulk generation to create dozens of unique test identifiers for automated test suites, and API developers use it to quickly produce a sample idempotency key or request ID while writing documentation. Database administrators also use it when manually inserting a record that needs a globally unique key, and students learning about distributed systems use it to see what a real version-4 UUID looks like instead of reading about the format in the abstract.
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Frequently asked questions
What is a UUID used for?
A UUID (universally unique identifier) is a 128-bit value used to uniquely identify database records, API objects, sessions, or files - without needing a central authority to guarantee uniqueness.
How likely is it that two generated UUIDs collide?
Astronomically unlikely - a standard v4 (random) UUID has so many possible values that generating billions of them still carries a negligible collision probability, which is why they're trusted for distributed systems.
Can I generate multiple UUIDs at once?
Yes - specify how many you need and generate a batch in one click.
