🔑UUID Generator
Generate UUID v4 values instantly with a browser-native cryptographic API instead of a hand-rolled algorithm. This UUID generator uses `crypto.randomUUID()` to create 128-bit identifiers that match the familiar 8-4-4-4-12 format developers expect for primary keys, mock API payloads, background jobs, session tracking, and distributed-system records. It is especially useful when you need one identifier immediately on page load, or when you need 10, 50, or 100 UUIDs in a batch for fixtures, seed scripts, and QA datasets. Because generation happens locally in the browser, there is no network request, no signup, and no delay. The page also explains that these are version 4 UUIDs generated from secure random bytes, making the output practical for day-to-day engineering tasks where fast copy-and-paste matters as much as standards compliance.
A UUID generator is a free online tool that creates UUID v4 identifiers in the standard 8-4-4-4-12 format using secure random values. It is commonly used by developers to create database keys, request IDs, mock data, session tokens, and test fixtures that need to stay unique across apps, environments, and distributed systems without manual coordination.
Generates UUID v4 values with crypto.randomUUID(). RFC reference
Press Enter to generate
How to Use the UUID Generator
Generate Instantly
The page creates one UUID v4 as soon as it loads, so there is always a value ready to copy without an extra click.
Choose Batch Size
Switch between 1, 10, 50, or 100 results depending on whether you need a single ID or a full set of fixtures for development and QA.
Copy and Use
Copy one UUID or the full batch and drop the values into database seeds, API payloads, session tests, or distributed tracing workflows.
Why Use a UUID Generator?
Database Keys in Distributed Systems
Teams often choose UUID v4 values over auto-incrementing integers when records can be created in multiple services, workers, or regions at the same time. Random UUIDs remove the need for central coordination and are easy to generate anywhere in the stack.
Mock Data and Seed Files
QA engineers and backend developers frequently need dozens of realistic IDs for fixtures, test payloads, and migration rehearsals. Batch generation makes it easy to copy 50 or 100 UUIDs into JSON, SQL, or API clients in a single step.
Request Tracing and Session Workflows
UUID v4 values are also useful for request IDs, correlation IDs, and temporary session identifiers in logs and integration tests. The format is recognizable, safe to paste into tooling, and convenient for debugging across multiple systems.