Online UUID & GUID v4 Generator

Generate cryptographically secure random UUID v4 identifiers in bulk with customizable casing and formatting.

100% Client-Side — your text never leaves this browser. Works offline. How it works

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Top keywords

Type or paste text to see keyword frequency
About this tool

About the UUID Generator

Generate bulk version-4 (v4) UUIDs and GUIDs online using cryptographically secure random bytes. Uppercase, lowercase, and hyphen options.

Cryptographically Secure v4

Uses crypto.randomUUID() and browser Web Crypto API for high-entropy RFC 4122 compliance.

Bulk Generation (1 to 100)

Generate single UUIDs or lists of 5, 10, 25, 50, or 100 unique UUIDs at once.

Custom Formatting Options

Toggle between lowercase and uppercase, with or without standard hyphens.

Wrap Quotes & Braces

Optionally wrap output in quotes or braces for SQL, JSON, or programming literals.

FAQ

Common questions

What is a UUID v4?

A Version 4 Universally Unique Identifier (UUID) is a 128-bit label generated using cryptographically strong pseudo-random numbers, with virtually zero chance of collision.

Is UUID v4 the same as a Microsoft GUID?

Yes, a Globally Unique Identifier (GUID) is Microsoft's implementation of the standard UUID specification.

How unique are the generated UUIDs?

There are approximately 5.3 x 10^36 possible UUIDs. The probability of generating a duplicate UUID is astronomically close to zero.

Can I copy all generated UUIDs at once?

Yes! Click "Copy Output" to copy the entire generated batch to your clipboard in one click.

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