Data & APIsSearch priority 78
UUID generator
Generate UUID v4 strings instantly for database keys, tracing, and tests—client-side, copy-ready.
Overview
Every refresh issues a new RFC 4122 version 4 UUID using cryptographically strong randomness when the browser supports it. Copy values directly into migrations, seed scripts, distributed traces, or mock data without leaving the tab. Pair with the JSON helper when you need identifiers inside structured payloads.
Generates a random RFC 4122 version 4 UUID in your browser.
Frequently asked questions
Are these UUIDs suitable for production database keys?
Version 4 UUIDs from a modern browser use the Web Crypto API (or an equivalent fallback) to collect random bytes, which is appropriate for general-purpose unique identifiers.
Do you guarantee global uniqueness?
UUID v4 values are statistically unique for practical purposes, but no client-side tool can offer an absolute guarantee without a central registry.
Can I generate multiple UUIDs at once?
Today the page issues one value per click. Batch generation can be added later if you need large sets.
Related tools
Editorial picks—swap these when analytics show new intent clusters.