About The UUID Generator

UUID Generator creates random UUID v4 identifiers for records, fixtures, correlation IDs, test payloads, and database seed data. You can generate one ID or a batch and copy the results as newline-separated values.

Generation runs locally in your browser using the Web Crypto APIs available to the page. The output is not checked against any external database, so your application should still enforce uniqueness where it stores IDs.

How to Generate UUIDs Online

1. Choose how many UUID v4 values to create.
2. Select lowercase or uppercase formatting.
3. Click Generate or load the sample batch.
4. Copy the generated list into your code, migration, spreadsheet, or test data file.

Choosing Options Correctly

Count:
Use a small count for quick one-off IDs and a larger count for mock datasets, import templates, or batch fixtures.

Output style:
Lowercase is common for APIs and databases. Uppercase is useful only when a legacy system or style guide expects it.

Common Use Cases

• Creating database keys for sample rows.
• Generating request, trace, or correlation IDs during testing.
• Building mock JSON, CSV, or API payloads.

Quick FAQ

Are these UUIDs time-sortable?
No. Standard random UUID v4 values are not time-sortable. Use UUID v7 or ULID when chronological ordering matters.

Does uppercase change the identifier?
No. UUID text is case-insensitive, so uppercase and lowercase forms represent the same value.

Are UUIDs generated locally?
Yes. The values are generated in the browser, so there is no need to send existing data to create them.

Can I use UUIDs as secrets?
No. UUIDs are identifiers, not passwords or access tokens. Use a dedicated secret generator for credentials.