UUID Generator

Free tool

About the UUID generator

This is a free UUID generator. Make version 4 UUIDs in your browser — one or many at once. Switch to uppercase, keep or drop the hyphens, then copy a single ID or copy them all. Everything runs in your browser, with no account and nothing to install.

What a UUID is

A UUID is a universally unique identifier: a 128-bit value used to label records, files, or objects without a central counter. The version 4 kind is almost entirely random, so separate systems can create UUIDs independently without ever producing the same ID.

Set the amount

Pick with the slider whether you need a single ID or a long list. Generate up to fifty at once to fill a table, label test records, or seed a codebase. Each run draws a completely fresh set.

Uppercase and hyphens

A standard UUID is written in lowercase with four hyphens. When a system expects capitals, turn on the uppercase switch; when a field or key wants a plain string, turn off the hyphens to get a 32-character format. The value is the same — only the look changes.

Where they are used

UUIDs are everywhere in database primary keys, API IDs, file names, session tokens, and distributed records. When they need to be unique with no risk of a clash, they are safer than a rising number, because two machines can generate IDs at the same time without conflict.

Private by default

Each ID is generated on your device and never sent anywhere. Nothing is uploaded, logged, or saved, so what you generate is yours alone. Close the tab and the list is gone — there is no history and no server copy.

Copy one or copy all

Each ID has its own copy button for grabbing a single result, and the copy-all button puts the whole list on your clipboard, one ID per line. Paste them straight into your code, a sheet, or a config file.

Why version 4 is enough

Version 4 fills 122 of its bits with random data, which is more than five undecillion possible values. At that scale the chance of two IDs matching is so small it never matters in normal use, even across millions of records. That is why most modern apps reach for v4 when they need an identifier that just has to be unique, without coordinating between servers or keeping a shared counter.

Related tools

To convert between units while you work, use the unit converter. For a random number in any range, use the random number generator. For a strong password in your browser, try the password generator. You can see the full set on the tools page.

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