Home › URL tools › UUID Generator

UUID / GUID Generator

Generate random UUID v4 values with the free UUID generator. Create one identifier or a batch of up to 100 instantly and privately, right in your browser. It is the quickest way to get unique keys for databases, APIs and test data without writing any code.

How many to generate

–

What is UUID Generator?

A UUID — a Universally Unique Identifier — is a 128-bit value written as 36 characters, such as 550e8400-e29b-41d4-a716-446655440000. It is used as a unique key for database rows, tokens, files and any record that must not collide with another. UUID v4 is the random version and the most common form on the web: it is built from randomly generated bits rather than a timestamp or a machine address, so every value is unique and unpredictable. Because it needs no central coordination, you can generate identifiers on any machine and be confident no other system will produce the same one. The chance of a collision is astronomically small — generating a billion per second for years barely moves the odds. This tool uses your browser's secure random generator, so the values are genuine and your work never leaves your device. It is ideal for database primary keys, API identifiers and testing. A generated id is not tied to a central counter, a timestamp or a machine address, so two systems can create identifiers independently without ever colliding.

How to use UUID Generator

Choose how many UUIDs you need, from 1 to 100.
Click “Generate” to create the values.
Copy the list and paste it into your app, database or test data.

Example

Count 1 Output: 728f3c9a-1a4d-4f0e-b1c2-3e5f8a6b9c01 Every generated string follows the v4 pattern: the third group starts with a 4 and the fourth starts with 8, 9, a or b.

Common use cases

Generating primary keys for a database table without a central counter.
Creating unique ids for API resources, sessions or tokens.
Seeding test data that must not clash with real records.
Producing temporary identifiers for tracking and references.

Pro tips

Use v4 for general-purpose id generation — it needs no coordination seed.
For extra certainty that the id is truly random on every device, the tool uses the browser's secure random source.
Copy the whole list in one click when you need many ids for a batch of records.

FAQ

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier written as 36 characters, used as a unique key for records.

What is a UUID v4?

UUID v4 is generated from random bits, so each value is unique and unpredictable. It is the most common form on the web.

Are these genuinely random?

Yes. They use the browser's secure random generator, not a simple counter.

Is a GUID the same thing?

Yes. GUID is Microsoft's name for essentially the same kind of identifier.

How many can I generate at once?

Up to 100 in a single batch.

Is it free and private?

Yes. It runs entirely in your browser and nothing is uploaded.

Could two UUIDs ever match?

Essentially never — the chance of a collision is astronomically small.

Where are UUIDs used?

Database primary keys, API identifiers, sessions, tokens and test data.