UUID / GUID Generator

What is UUID / GUID Generator?

A UUID (Universally Unique Identifier) or GUID is a 128-bit value standardized under RFC 4122 to uniquely identify information across distributed computing architectures without centralized coordination. Our tool generates cryptographically random UUID v4 and timestamp-based v1 identifiers in bulk (up to 50) using the browser’s native Web Crypto API CSPRNG with zero server dependencies.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the UUID / GUID Generator

1. 1
   Select your desired UUID version (Version 4 Random or Version 1 Timestamp-based).
2. 2
   Choose your output quantity using the counter (generate from 1 up to 50 UUIDs simultaneously).
3. 3
   Customize formatting toggles: Upper/Lowercase, standard hyphens, no hyphens, curly braces ({...}), or C-array syntax.
4. 4
   Click "Generate UUIDs" to trigger instant local generation, then copy individual keys or export the full batch as a .txt list.

Formula & Calculation Logic

Conforms strictly to RFC 4122 §4.4. Utilizes window.crypto.getRandomValues() to populate 16 random octets, setting the 4-bit version nibble to 0100 (4) and the 2-bit variant nibble to 10 (DCE 1.1 variant).