UUID Generator Online
Generate random UUIDs (v4) and other UUID versions instantly in your browser.
Click a button above to generate UUIDs
What Is a UUID Generator?
UUID Generator is a free online tool that generate random UUIDs (v4) and other UUID versions instantly in your browser. No files are uploaded — everything is processed locally on your device.
A UUID (Universally Unique Identifier) generator creates 128-bit identifiers that are statistically guaranteed to be unique across space and time. UUIDs are used in databases, APIs, distributed systems, and session management to identify resources without requiring a central authority. Our generator creates UUIDs entirely in your browser using cryptographically secure random number generation.
Privacy guarantee: UUID Generator processes all files directly in your browser using WebAssembly. No data is uploaded to any server, no information is collected, and the tool works offline after loading. Unlimited usage with no signup, no watermarks, and no file size limits.
How to Use UUID Generator
Select UUID version
Choose the UUID version to generate: v4 (random) is the most common, or select v1 (timestamp-based).
Generate UUIDs
Click Generate to create one or more UUIDs instantly.
Copy the result
Copy individual UUIDs or the entire batch to your clipboard.
Why Use Our UUID Generator?
Frequently Asked Questions
What is the difference between UUID v1 and v4?
UUID v1 is generated using the current timestamp and the machine's MAC address, making it time-sortable but potentially revealing information about when and where it was created. UUID v4 is generated from random numbers and is the most widely used version for its simplicity and privacy.
Can two UUIDs ever be the same?
Theoretically yes, but the probability is astronomically low. With UUID v4, you would need to generate approximately 2.7 quintillion UUIDs to have a 50% chance of a single collision. For all practical purposes, UUIDs are unique.
What format does a UUID use?
A UUID is a 128-bit number displayed as 32 hexadecimal digits in the format 8-4-4-4-12, such as 550e8400-e29b-41d4-a716-446655440000. The hyphens are optional but conventional.
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