UUID Generator

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Fast, secure, 100% browser-based tools for formatting JSON, encoding URLs, Base64 conversion, HTML entities, and UUID generation.

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Generate RFC 4122 compliant v4 UUIDs client-side

100% Client-Side Only

Indentation: 2 Spaces 4 Spaces Tab

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SPECIFICATION

RFC 4122 v4 UUID Generation

Features and customization options for unique identifier generation.

Bulk Generation

Generate up to 100 unique identifiers at once, separated cleanly line by line for database seeds, mock data, and test environments.

Case & Hyphen Options

Toggle between lowercase and uppercase characters, with or without hyphens, or wrapped in standard curly braces {...}.

Cryptographically Strong

Powered by native browser hardware-backed randomness (Web Crypto API) ensuring unmatched uniqueness and zero server logging.

FAQ

UUID Generator Questions

What is a Version 4 UUID?

A Version 4 Universally Unique Identifier (UUID) is a 128-bit label generated using cryptographically secure pseudorandom numbers. The probability of generating two identical v4 UUIDs is practically zero (1 in 2^122).

How are UUIDs generated in this tool?

This tool uses the browser's native Web Cryptography API via crypto.randomUUID(), providing high-entropy, cryptographically strong random bits directly on your device.

What is the difference between a UUID and a GUID?

GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. In practice, GUID and UUID are synonymous terms referring to 128-bit unique identifiers formatted as 8-4-4-4-12 hexadecimal digits.