UUID Generator

Generate RFC 4122 UUID v4 values instantly with batch output, formatting options, and one-click copy.

Generation settings

Choose a whole number from 1 to 1000.

Output format
Letter case

UUID v4 follows RFC 4122 and is generated with secure browser randomness.

Everything is generated locally in your browser. No UUIDs are stored or uploaded.

Generated UUIDs

Click Generate to create UUIDs.

When to use UUID Generator

Common ways to use UUID Generator:

  • Create UUIDs for development

    Generate one or many UUID v4 values for API payloads, fixtures, and local testing without leaving the browser.

  • Validate batch size choices

    Check that you are generating the right number of identifiers before sharing them with teammates or test scripts.

  • Debug formatting workflows

    Switch between lowercase, uppercase, and brace-wrapped output to match strict formatting requirements in code or tools.

  • Copy clean identifiers quickly

    Copy a single UUID or the entire batch for documentation, tickets, imports, or seed data.

  • Generate IDs on mobile

    Create UUIDs from a phone or tablet with the same fast controls and readable output.

Frequently Asked Questions

How do I use this app?
Choose the batch size, adjust uppercase or brace formatting if needed, click Generate, and review the results. You can copy a single UUID, copy the whole list, or clear everything to start over.
Is this app free to use?
Yes. UUID Generator is free to use and does not require an account.
What happens to my input data?
This app does not send or store your UUIDs on a server. Generation happens locally in your browser.
Why am I getting an error or unexpected output?
Most issues come from an invalid batch size or a browser environment without secure randomness support. Check the number you entered and make sure your browser supports modern Web Crypto features.
Where can I find instructions and troubleshooting tips?
Open the in-app Help panel for a quick explanation of the settings, formatting options, copy actions, and common gotchas. The panel is keyboard accessible and closes with Escape.