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General dev

Bulk UUID v4 Generator

Runs locally

Use Bulk UUID v4 Generator

What it does

Generate a batch of random version 4 UUIDs for test data, fixtures or database seeds, then copy them or download them as a text file.

It runs entirely in your browser: nothing you enter is uploaded.

Example

Five UUIDs

Input
5
Output (captured 2026-10-20)
52eedb14-cd9b-42d1-94de-49357e134393
9abb506a-a1b8-4c96-add6-0fe569a02b49
56e32b53-0de6-4620-8311-e08eecd9ecfc
96bedef6-aea8-4f37-b716-260959f8e3c0
1e89b640-1b8b-4504-b78b-adf42a7fc870

Five random UUIDs, one per line, each with 4 as the version digit and 8, 9, a or b as the variant digit.

FAQ

How are the UUIDs generated?

Each one is 16 bytes from crypto.getRandomValues with the version bits set to 4 and the variant bits set as RFC 9562 (formerly RFC 4122) requires, which leaves 122 random bits. They carry no timestamp or machine information.

How many can I make at once?

From 1 to 1,000: larger numbers are capped at 1,000, and an empty or zero count gives the default of 100. The No hyphens and UPPERCASE options change only how the values are written.

Are the UUIDs sent or stored anywhere?

No. They are generated in your browser, nothing is uploaded, and they exist only on the page until you copy or download them.

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