UUID Generator

How to use UUID Generator

1. 1

   Choose how many

   Type how many UUIDs you need, from 1 up to 100. A batch of five is filled in by default so you can start straight away.

2. 2

   Pick a format

   Toggle “Uppercase” for capital hex digits and “Remove dashes” for a compact, hyphen-free 32-character string — combine them however your project needs.

3. 3

   Copy or download

   Your UUIDs appear one per line. Copy them all to the clipboard or download them as a .txt file with a single click.

4. 4

   Regenerate any time

   Need a different set? Press Regenerate to produce a brand-new batch of random UUIDs using the same settings.

Key features

• Generate 1–100 random version-4 UUIDs at once
• One UUID per line, ready to copy or download
• Optional UPPERCASE output
• Optional dash removal for compact 32-character ids
• Uses the browser’s secure crypto.randomUUID generator
• Runs entirely in your browser — no sign-up, no limits, nothing stored

Frequently asked questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value, usually written as 32 hexadecimal digits in five dash-separated groups like 123e4567-e89b-12d3-a456-426614174000. It’s designed to be unique without a central authority, so different systems can each mint ids that won’t collide. UUIDs are widely used as database keys, request/correlation ids, file names and more.

What is UUID v4?

Version 4 is the random variant of UUID: nearly all of its bits are filled from a random or pseudo-random source, with a few fixed bits marking it as version 4. Because it doesn’t encode a timestamp or MAC address, a v4 UUID reveals nothing about where or when it was created — which is exactly why it’s the most common choice for general-purpose unique ids.

What’s the difference between a UUID and a GUID?

There is essentially no difference. GUID (Globally Unique Identifier) is Microsoft’s name for the same 128-bit identifier standard; “UUID” and “GUID” are used interchangeably and have the same format. The UUIDs this tool produces are valid GUIDs and vice versa.

Are these UUIDs unique and safe to use?

Yes. They’re generated with crypto.randomUUID(), your browser’s cryptographically-secure random source, which gives roughly 122 random bits per id. The chance of generating the same v4 UUID twice is so vanishingly small that they’re treated as unique in practice. Note that uniqueness is statistical rather than guaranteed, so for very large datasets databases still enforce a unique constraint as a safeguard.

Does removing dashes or changing case affect uniqueness?

No. The dashes are just visual separators and case only changes how the hexadecimal digits are displayed — the underlying 128-bit value is identical. A dash-free, uppercase UUID represents exactly the same id as its lowercase, hyphenated form, so it stays just as unique.

Is anything sent to a server?

No. The generator runs entirely in your browser, so once the page has loaded it works offline and every UUID is created locally. Nothing you generate is uploaded, logged or stored anywhere.

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