UUID generator

About UUID generator

Generates one or many version-4 UUIDs in your browser using crypto.randomUUID, with no request to a UUID web service.

I have bookmarked 'online UUID generator' more times than I will admit, then watched it make a network request to print 16 random bytes. Your browser has been able to do this for years. crypto.randomUUID() is a version-4 UUID from the same CSPRNG the rest of the web security stack uses.

Set a count from 1 to 200 and click Generate. The list is one UUID per line so you can paste it into a fixture file or a spreadsheet column. Click again for a new batch; nothing is persisted. I did not add v1 (those embed a timestamp and, historically, a MAC) or v5 (those are hashes of a name) because the button people actually want is v4.

These are identifiers, not secrets. They are hard to guess and still the wrong thing to use as a session token if your threat model includes a stolen database plus no other auth. Use them for row ids, test data, and request correlation. If you need a secret, use a dedicated random key, not a UUID labelled as one.

How to use UUID generator

1. 1Choose how many UUIDs you want, up to 200.
2. 2Click Generate.
3. 3Copy the list from the main pane.

What it won't do

• —v4 only, 200 per click.
• —Not a secret generator and not a ULID/NanoID tool.

Common questions

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