A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

What version of UUID does this generate?

This tool generates UUID version 4 (v4), which is randomly generated. It uses the browser's built-in crypto.randomUUID() API for cryptographically secure random values.

How unique are these UUIDs?

UUID v4 has 122 bits of randomness, giving approximately 5.3 × 10^36 possible values. The probability of generating two identical UUIDs is astronomically small — effectively zero for any practical use case.

Can I generate multiple UUIDs at once?

Yes. Use the slider to set how many UUIDs to generate (up to 50), then click Generate. You can copy all of them to the clipboard at once with the 'Copy All' button.

Are the generated UUIDs stored anywhere?

No. UUIDs are generated entirely in your browser using the Web Crypto API and are never sent to any server.

What is the difference between UUID and GUID?

GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical.

Are the generated UUIDs truly unique?

UUID v4 uses 122 bits of randomness, giving approximately 5.3 x 10^36 possible values. The probability of generating two identical UUIDs is negligibly small.

Is this cryptographically secure?

Yes. The tool uses the browser's Web Crypto API (crypto.getRandomValues()) for cryptographically secure random number generation.

UUID Generator — Generate Random UUIDs v4 Free Online

Generate random UUIDs (v4) instantly. Bulk generate and copy with one click. Free UUID generator - no sign-up required.

Number of UUIDs to generate5

Uppercase

1b00ea47e-ae73-4501-81bb-9ee4f124292d

100% Private

No Upload

Instant

What is UUID Generator?

A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all space and time. UUID v4 uses random numbers to generate identifiers. UUIDs are widely used in databases, APIs, and distributed systems to uniquely identify records without a central authority. Our UUID Generator uses the browser's Web Crypto API to generate cryptographically random UUIDs.

How to Use UUID Generator

1Click Generate to create a new UUID.
2Use the Bulk Generate option to create multiple UUIDs at once.
3Click Copy to copy a UUID to your clipboard.

Key Features

UUID v4 generation using Web Crypto API
Bulk generation (up to 100 at once)
One-click copy
Instant generation
No sign-up required

Benefits

Generate unique IDs for database records
Create unique identifiers for API resources
Test applications with realistic UUID data

Use Cases

Generate UUID guide Best Dev Tools 2026 Hashing vs Encryption Hash Generator

Why Use Irreva for UUID Generator?

Generate unique IDs for database records

Create unique identifiers for API resources

Test applications with realistic UUID data

Runs 100% in your browser — files never leave your device.

No account, no sign-up, no subscription — free forever.

Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

UUID vs GUID UUID explained

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