Generate UUIDs at scale, validate existing UUIDs, and copy in developer-friendly formats. Fast, private, and runs entirely in your browser.
crypto.randomUUID();
import { randomUUID } from "crypto";
randomUUID();UUID information
Explore these related free tools to enhance your productivity and workflow.
UUID stands for Universally Unique Identifier. It's a 128-bit identifier that is guaranteed to be unique across time and space. UUIDs are commonly used in software development for generating unique IDs for database records, API endpoints, and distributed systems.
UUID v4 (random) generates completely random UUIDs using cryptographically secure random numbers. UUID v1 (timestamp-based) includes a timestamp and MAC address, making them sortable by creation time. Version 4 is more commonly used for privacy reasons.
Paste your UUID into the validator field. The tool checks the UUID format and shows: version (v1/v4) and variant (RFC 4122). Try our JSON Formatter (/json-formatter) if you're embedding UUIDs in JSON.
GUID is Microsoft's name for UUID. In practice, GUIDs are usually UUIDs. Most modern GUID/UUID values follow RFC 4122 and are compatible across systems.
Use UUID v4 for most cases (random, privacy-friendly). Use UUID v1 if you need time-ordering properties (timestamp-based).
In practice, UUID collisions are astronomically unlikely—especially for UUID v4 generated using cryptographically secure randomness. While no system can guarantee absolute uniqueness forever, UUIDs are designed to be effectively unique for real-world applications.
Auto-increment IDs are small and fast but can leak record counts and require coordination across databases. UUIDs are globally unique across systems, great for distributed apps and offline-first sync, but are larger and may impact index performance unless you design your schema carefully. If you need random tokens instead, try Random String Generator (/random-string-generator) or API Key Generator (/api-key-generator).
Yes—UUIDs are widely used in production databases. For best performance, store them in efficient types (like UUID/BINARY), index thoughtfully, and consider v1/time-ordered UUIDs when write locality matters.
A UUID is 128 bits shown as 32 hex characters in 5 groups: 8-4-4-4-12. The version is encoded in the 3rd group, and the variant (RFC 4122) is encoded in the 4th group.
You can generate up to 1000 UUIDs at once. Use the presets (10, 50, 100) or the count slider/input, then generate. You can copy UUIDs individually or export them in bulk formats.
Yes! Our UUID generator is 100% free with no registration required, no usage limits, and no hidden fees. You can generate as many UUIDs as you need.
No, all UUID generation happens locally in your browser using the Web Crypto API. We don't store, save, or have access to any UUIDs you generate. Your privacy is completely protected.
Yes! The UUIDs generated use the browser's cryptographically secure random number generator (crypto.randomUUID()), which meets RFC 4122 standards and is suitable for production use.