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UUID Generator
Generate random version 4 UUIDs (also called GUIDs) instantly. Everything runs locally in your browser using its cryptographic random number generator — nothing is uploaded.
UUIDs are generated entirely on your device using the browser's cryptographic RNG (crypto.randomUUID()). No network calls are made.
What is a UUID?
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier) on Microsoft platforms, is a 128-bit value used to uniquely identify information without a central authority. It is written as 32 hexadecimal digits split into five groups separated by hyphens, in the form 8-4-4-4-12, for example f47ac10b-58cc-4372-a567-0e02b2c3d479.
How to use it
1. Set How many to the number of UUIDs you need (1–100). 2. Tick Uppercase if you want the hex digits in capitals. 3. Click Generate — each UUID appears on its own line above. 4. Click Copy to copy them all to your clipboard.
UUID v4 explained
Version 4 UUIDs are generated from random (or pseudo-random) numbers. Of the 128 bits, a few are reserved to mark the version (4) and variant, leaving 122 random bits — enough that the chance of a collision is negligible for practical purposes. This generator uses crypto.randomUUID(), which draws from the browser's cryptographically secure random source, so the output is suitable for identifiers such as database keys, request IDs, and tokens.