UUID v4 Generator

Generate Version 4 UUIDs.

How many UUIDs?

About UUID v4 Generator

Cryptographically secure Version 4 UUID (Universally Unique Identifier) generator conforming to RFC 4122, featuring single and batch generation with entropy validation.

Key features

Generation backed by crypto.getRandomValues() providing 122 bits of true cryptographic entropy.
Strict compliance with RFC 4122 section 4.4 (version 4 indicator and variant 1 bits 10xx).
Batch generation capability producing up to 1,000 distinct UUIDs in a single instant.
Flexible formatting options: uppercase, lowercase, with hyphens, or compact without hyphens.

How to use

Choose Generation Quantity: Select how many UUIDs you need (from 1 to 500+).
Configure Format Options: Select uppercase or lowercase casing and toggle hyphen separators.
Generate & Copy UUIDs: Click "Generate" and copy the unique identifiers to your clipboard.

FAQ

What is an RFC 4122 Version 4 UUID?

A 128-bit identifier where 122 bits are cryptographically random, 4 bits indicate Version 4, and 2 bits indicate the RFC 4122 variant.

How likely is a UUID v4 collision?

Extremely improbable: you would need to generate over 1 billion UUIDs per second for 85 years before having a 50% chance of a single collision.

What is the difference between UUID v4 and UUID v1?

UUID v1 is based on the host MAC address and current timestamp, while UUID v4 is purely random, ensuring privacy without leaking network identifiers.

Can UUIDs be used as primary keys in SQL databases?

Yes, though because they are unordered, developers frequently use ULIDs or sequential UUIDs to optimize B-tree index performance.

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