UUID Generator
Generate random UUID v4 identifiers instantly in your browser. Create unique IDs for databases, APIs, and applications with one click — no server required
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Click Generate to create UUIDs.
Generated using the Web Crypto API — random UUID v4, entirely in your browser.
Runs 100% Locally in Your Browser
This tool processes your data entirely on your device. Nothing is uploaded, stored, or sent to any server.
No Uploads
Privacy First
Secure by Default
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Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value formatted as 32 hex digits in five groups (e.g. 550e8400-e29b-41d4-a716-446655440000), designed to be globally unique.
What is UUID v4 and how is it generated?
UUID v4 is randomly generated — 122 of its 128 bits are random, making the probability of collision astronomically low.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's term for the same concept — a UUID and a GUID are the same format and interchangeable.
How likely is it that two generated UUIDs will collide?
With v4 UUIDs you would need to generate roughly 2.7 quintillion UUIDs before reaching a 50% chance of a single collision — practically impossible.
When should I use a UUID for my application?
Use UUIDs when you need unique identifiers across distributed systems or databases without a central counter — common for primary keys, session IDs, and file names.
Is a UUID generated on the server or in my browser?
It is generated entirely in your browser using the Web Crypto API's cryptographically secure random number generator — no server is involved.