UUID Generator

Generate random v4 UUIDs in bulk — copy one or a hundred. Free, instant.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Options

How many

Hyphens Uppercase

UUIDs (v4)

Cryptographically random (crypto API) · never sent or stored

How to use it

Set how many UUIDs you want and press generate — each is a random v4 UUID. Copy a single one or the whole list, and optionally drop the hyphens or force uppercase to match your system.

UUID Generator — TechWhack Score

9.3/10

Privacy 10/10

UUIDs are generated in your browser — nothing is sent.
Speed 10/10

Generates as many as you ask for, instantly.
Features 7/10

Creates version-4 (random) UUIDs from your browser’s cryptographic source; pick how many you need and copy them.
Free 10/10

No sign-up, no daily limit, embeddable.

Verdict: Cryptographically random v4 UUIDs in a batch, generated locally and ready to copy.

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A UUID generator creates universally unique identifiers — 128-bit values used as database keys, request IDs and more. This tool generates version-4 (random) UUIDs using your browser’s cryptographic random source; pick how many you need and copy them.

Why v4 UUIDs

Version 4 UUIDs are random, so they don’t leak timing or hardware info and collide only with astronomically small probability — ideal for keys and identifiers generated client-side.

FAQ

What is the difference between UUID v4 and v1?UUID v1 is built from a timestamp and the machine network address, so it is time-ordered but can reveal where and when it was made; v4 is random, with no embedded device info. This tool makes v4, which is the common choice for privacy and simplicity.

How likely is it that two UUIDs are ever the same?Essentially impossible in practice: a v4 UUID has 122 random bits, giving about 5.3 x 10^36 possible values, so you would need to generate a billion per second for roughly 100 years to reach even a 50 percent chance of a single collision. For everyday use you can treat them as unique.

Can I generate many UUIDs at once?Yes. Choose how many you need and they are produced in a batch ready to copy, which is handy for seeding databases or test data. There is no daily limit, just a sensible per-batch amount.

Are these UUIDs safe to use as secret tokens?A v4 UUID is random and generated with the browser crypto, but the standard does not intend UUIDs as security tokens, so do not rely on them as unguessable secrets for authentication. Use a dedicated secure token for that purpose.