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UUID Generator
Generate v1 and v4 UUIDs in bulk.
uuid-generator.tool
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Click Generate to create UUIDs
Generated using your browser's cryptographically secure random generator - nothing is sent to a server.
What is a uuid generator?
This tool generates RFC 4122 version 4 UUIDs (also called GUIDs) - random, cryptographically secure identifiers - in bulk. Generate anywhere from one to two hundred at once, with formatting options for hyphens and case.
How to use this tool
- 1Set how many UUIDs you need (1–200).
- 2Toggle hyphens and uppercase formatting to match what you need.
- 3Click Generate.
- 4Copy an individual UUID, copy them all at once, or download as .txt, .json, or .csv.
Common use cases
Generating unique IDs for database records or test fixtures
Creating a batch of sample UUIDs for seeding a development database
Getting a single UUID for a config value or API key placeholder
Producing UUIDs in a specific case/format convention a codebase expects
Good to know
Frequently asked questions
Are these cryptographically random?
Yes - they're generated using your browser's built-in crypto.randomUUID(), the same cryptographically secure random source used for security-sensitive values, not a weaker Math.random()-based generator.
What UUID version does this generate?
Version 4 (random) - by far the most commonly used version for general-purpose unique identifiers, as opposed to version 1 (timestamp + MAC address based) or other specialized variants.
Can I generate UUIDs without hyphens?
Yes - turn off the Hyphens toggle to get the 32-character form some systems expect instead of the standard 8-4-4-4-12 hyphenated format.
Is there a limit to how many I can generate at once?
200 per batch, to keep the page responsive - run it again for more.
quick_facts.json
{
"runs_in_browser": true,
"data_sent_to_server": false,
"signup_required": false,
"price": "free",
"category": "Security"
}