What kind of UUIDs does it generate?

Version 4 (random) UUIDs, also called GUIDs, generated with your browser's cryptographically secure random source.

Can I generate many at once?

Yes. Choose how many (up to 10,000) and copy or download them all at once, with options for uppercase, no dashes or braces.

Are they unique and private?

v4 UUIDs have 122 random bits, so collisions are practically impossible. They are generated entirely in your browser and never sent anywhere.

Free · Cryptographically random · No sign-up

UUID generator

Generate random UUID v4 / GUIDs — one or thousands at once, with uppercase, no-dash and brace options. Cryptographically random, right in your browser.

How many Uppercase No dashes {Braces}

🔒 UUIDs are generated on your device with crypto-strength randomness — nothing is uploaded.

How to generate a UUID

Create random, collision-resistant UUID v4 / GUID identifiers — one or thousands at a time.

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1. Choose options

Pick formatting like uppercase, hyphens or braces.

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2. Set how many

Generate a single UUID or a bulk list for seeding and testing.

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3. Copy

Copy one ID or the whole list to your clipboard.

UUIDs (also called GUIDs) are unique identifiers used for database primary keys, API request IDs, file names, distributed systems and test fixtures. Version 4 UUIDs are generated from cryptographically strong random values in your browser, so they're effectively unique and never sent anywhere. Need other random data? Try the Password Generator or Hash Generator.

UUID generator FAQ

What version are these?

Version 4 (random) UUIDs / GUIDs, made with your browser's secure random source.

Can I bulk generate?

Yes — up to 10,000 at once, with uppercase, no-dash and brace options, then copy or download.

Are they unique?

v4 UUIDs have 122 random bits, so practical collisions never happen.