Generate random UUIDs (v4) and GUIDs instantly. Choose from multiple formats and generate up to 100 at once.
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Version 4 UUIDs are randomly generated and have the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
UUID and GUID (Globally Unique Identifier) are essentially the same thing. GUID is the term used by Microsoft, while UUID is the standard term used in most other contexts. Both follow the same specification (RFC 4122).
While theoretically possible, the probability of generating two identical UUIDs is astronomically low. A v4 UUID has 122 random bits, meaning you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a collision.
Yes. This tool uses the browser's built-in crypto.randomUUID() method, which generates cryptographically secure random UUIDs.