100% PrivateNo ServerFree
1 UUID
737a9067-fde3-47b4-b809-c2306d2228f9

How It Works

1

Configure Options

Choose count, case, and dash preferences for your UUIDs.

2

Generate

Click Generate to create new UUIDs using your browser's crypto API.

3

Copy

Copy individual UUIDs or all at once with a single click.

Frequently Asked Questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. The format is 8-4-4-4-12 hexadecimal characters, like 550e8400-e29b-41d4-a716-446655440000.
What is UUID v4?
UUID v4 is a randomly generated UUID. It uses 122 bits of randomness (6 bits are fixed to indicate version 4 and variant 1). The probability of collision is astronomically low.
Are UUIDs truly unique?
While not mathematically guaranteed unique, UUID v4 uses 122 bits of randomness, making collision probability about 1 in 2^122. You would need to generate 2.7 quintillion UUIDs to have a 50% chance of one collision.
When should I use UUIDs?
UUIDs are useful for database primary keys, distributed systems, session identifiers, file naming, and any scenario where you need unique identifiers without a central authority.
Is this generator secure?
Yes, this tool uses crypto.getRandomValues() which is a cryptographically secure random number generator built into your browser. All generation happens locally.
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About UUID Generator

What this tool does

Generator tools create passwords, UUIDs, Lorem Ipsum placeholder text, QR codes, barcodes, fake data sets, random numbers, and various code snippets. Each output is generated fresh on every click using cryptographic or pseudo-random algorithms.

Why use this tool

Developers and designers constantly need test data, unique identifiers, and placeholder content during prototyping. Generating them locally avoids dependency on external APIs and keeps sensitive outputs like passwords off the network.

How it works

For security-sensitive outputs (passwords, UUIDs), the tool uses the Web Crypto API's crypto.getRandomValues(). For placeholder text, it assembles words from a built-in dictionary. QR codes and barcodes are rendered to canvas or SVG.

Pro tip

For passwords, enable all character classes and use at least 16 characters. A passphrase of 4-5 random dictionary words is equally strong and much easier to remember.

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