UUID Generator

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier that is guaranteed to be unique across all space and time. UUIDs are fundamental to modern software development, used extensively in databases, distributed systems, APIs, and anywhere unique identification is needed without central coordination.

Our free online UUID generator creates cryptographically secure Version 4 UUIDs using your browser's built-in crypto.getRandomValues() API. Version 4 UUIDs are randomly generated and are the most commonly used UUID version in modern software. Each UUID has an astronomically low probability of collision — you would need to generate about 2.71 quintillion UUIDs to have a 50% chance of a duplicate.

This tool supports bulk generation of up to 100 UUIDs at once, with options to customize the format including uppercase/lowercase and with or without hyphens. Every UUID is generated entirely in your browser with no server communication, ensuring both speed and privacy.

UUIDs follow the standard format of 32 hexadecimal digits displayed in five groups separated by hyphens: 8-4-4-4-12 (e.g., 550e8400-e29b-41d4-a716-446655440000). The version number is embedded in the 13th digit position.

1. Set the count — Enter the number of UUIDs you want to generate (1 to 100).
2. Choose format options — Toggle uppercase for capital letters, and toggle hyphens to include or remove the dash separators.
3. Click Generate — Press the Generate button to create your UUIDs instantly.
4. Copy individual UUIDs — Click the Copy button next to any UUID to copy it to your clipboard.
5. Copy all UUIDs — When generating multiple UUIDs, click Copy All to copy them all at once, separated by newlines.