UUID Generator

Generate standard UUID v4 identifiers instantly. Create single or bulk UUIDs in multiple formats. Validate UUID format. 100% client-side, secure random generation.

Quantity

Single Bulk

Output Format

UUID Validator

About UUID Generator

Universally Unique Identifiers (UUIDs) are 128-bit numbers used to identify information in computer systems. UUID v4 is randomly generated using cryptographically secure random numbers, making collision probability practically zero. This tool generates RFC 4122 compliant UUIDs entirely in your browser — no data is sent to any server.

Features

Pure client-side — UUIDs never leave your device
Cryptographically secure random generation via Web Crypto API
Single or bulk generation (up to 100 at once)
Multiple output formats: standard, compact, uppercase, URN
Built-in UUID format validator
One-click copy for individual or all results

Frequently Asked Questions

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. The most common version is v4, which is randomly generated.

Are these UUIDs truly unique?

UUID v4 has 2^122 possible combinations, making the probability of collision astronomically low (about 1 in 2.71 quintillion). For practical purposes, they are unique enough for virtually all applications.

Is the generation secure?

Yes. We use the browser's built-in crypto.getRandomValues() API, which provides cryptographically secure random numbers suitable for security-sensitive applications like session tokens and API keys.

What are the different formats?

Standard format includes hyphens (xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx). Compact removes hyphens. Uppercase converts to capital letters. URN adds the urn:uuid: prefix as defined in RFC 4122.