What is a UUID / GUID?
A Universally Unique Identifier (UUID) — also known as a Globally Unique Identifier (GUID) in the Microsoft ecosystem — is a 128-bit label used for information in computer systems. They are extremely useful because they do not require a central authority to administer them, and the probability of a duplicate is practically zero.
The standard UUID format looks like this: 123e4567-e89b-12d3-a456-426614174000.
Version 4 UUIDs (Random)
This generator specifically creates Version 4 UUIDs. Unlike Version 1 (which relies on MAC addresses and time), Version 4 uses completely random or pseudo-random numbers. Out of the 128 bits, 122 are randomly generated, making the chance of a collision (generating the same UUID twice) astronomically small.
Local Cryptographic Processing
This tool uses your browser's native `Crypto.randomUUID()` API when available. It executes locally, meaning you can generate millions of identifiers safely without exposing any data limits or tokens to external servers. It is securely sandbox-isolated to your current browser window.
Features
- Bulk Generation: Need fake data for your database? Generate up to 1,000 UUIDs at once.
- Format Toggles: Choose whether you want hyphens (standard formatting) or contiguous strings, and select between upper or lowercase letters.
- One-Click Copy: Export the entire list to your clipboard instantly.