UUID Generator
Generate random UUID v4 identifiers instantly. Toggle case, hyphens, and batch count — all in your browser.
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About this tool
A UUID Generator is an essential utility for developers, system architects, and database administrators who need unique identifiers across distributed systems. UUID v4 generates random 128-bit values in the standard 8-4-4-4-12 hexadecimal format, offering approximately 2122 possible values — collisions are so unlikely that they are effectively zero for practical purposes. Backend developers use UUIDs as database primary keys, avoiding the sequential-guessing problem of auto-increment IDs and enabling conflict-free merging of records from different databases or offline clients. API designers assign UUIDs to requests, sessions, and resources to enable idempotent operations and trace requests across microservice boundaries. System architects building distributed databases, event-sourcing pipelines, and offline-first applications rely on UUIDs to generate collision-free identifiers without central coordination. QA engineers and testers use UUIDs to seed fake-but-realistic user data and create unique test entities in automated test suites. This tool generates UUID v4 values entirely in your browser using the Web Crypto API, with a safe fallback for older browsers. You can generate single IDs or batches up to 100 at once, toggle between uppercase and lowercase hex digits, and choose whether to include hyphens. No data is ever sent to any server.