UUID Generator

What is UUID Generator?

UUID Generator (v4) generates cryptographically secure Universally Unique Identifiers (UUIDs) and Globally Unique Identifiers (GUIDs) adhering to RFC 4122 specifications. UUID v4 identifiers are 128-bit numbers represented as 36-character hexadecimal strings (8-4-4-4-12 format, e.g. f47ac10b-58cc-4372-a567-0e02b2c3d479). UUIDs are essential across software engineering to generate unique database primary keys, session tokens, transaction IDs, and distributed system event identifiers without central coordination.

How to use UUID Generator

Select the number of UUIDs to generate (from 1 to 1,000 bulk UUIDs). Toggle settings: uppercase vs lowercase letters, hyphens inclusion, or wrapping in braces/quotes. Click 'Generate UUIDs' to create secure identifiers instantly. Copy the generated list or download it as a .txt file.

Key features

• Cryptographically secure UUID v4 generation using Web Crypto API
• Bulk generation support up to 1,000 UUIDs per click
• Custom formatting toggles: uppercase/lowercase, hyphens, braces, quotes
• RFC 4122 standard compliance
• One-click copy and text file download commands
• 100% private browser client-side execution

Common use cases

• Generating unique primary key IDs for database seeding (PostgreSQL UUID, MongoDB, MySQL)
• Creating API session tokens, transaction IDs, and correlation request IDs
• Generating mock GUID test data for software unit testing suites

Technical details & standards

UUID v4 generation leverages the browser's cryptographically strong random number generator API (crypto.getRandomValues). The 128-bit value contains 122 bits of true cryptographically secure entropy, ensuring virtually zero probability of duplicate collision. All UUID generation occurs 100% client-side inside your browser runtime. Generated UUIDs are never logged or stored anywhere.

Frequently asked questions