Data & APIs
UUID generator
Generate RFC 4122 UUID v4 strings instantly for database keys, distributed tracing, mock data, and tests. Uses Web Crypto—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 UUID v4 values from this generator OK for database and API 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.
Is a random UUID guaranteed to be unique worldwide?
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 or in bulk?
Today the page issues one value per click. Batch generation can be added later if you need large sets.
Related tools
Tools that complement this one—same upfront privacy notes apply.