Tools

UUID Generator — Create UUID v4 Online (Free)

Generate UUID v4 identifiers online for free. Bulk-create unique IDs one at a time or in batches — all in your browser, nothing uploaded.

All tools run in your browser — nothing you process is ever uploaded.

How to Use

  1. Set how many UUIDs you want — the default is 5, and you can ask for up to 100 in one batch.
  2. Click Generate. Every UUID appears on its own line in the output box.
  3. Click Copy to copy the whole list, then paste it wherever you need it.

Generation runs entirely in your browser using the platform’s cryptographic random source. Nothing is sent to any server, and every run produces fresh random values.

UUIDs are the standard way to identify objects in software — database rows, API records, order numbers, log events and more. Because version 4 UUIDs are random rather than sequential, they need no central coordination: any machine can create them without asking anyone else.

Tips

Click Generate again for a new set — every batch is different. If you only need one ID, set the quantity to 1. The output is plain text, one UUID per line, ready to paste into code, spreadsheets or database exports.

Why use it

Writing your own UUID generator correctly is harder than it looks: subtle bias in random number generation can produce predictable or colliding identifiers. This tool uses the browser’s cryptographically secure random generator and formats the result as a standard RFC 4122 version 4 UUID — no code to maintain, and your identifiers never leave your device.

Real-world use cases

  • API development: Format JSON responses from Chrome DevTools before committing fixtures.
  • Debugging: Validate timestamps, regex or hashes without switching to a terminal or IDE.
  • On-call fixes: From your phone, quickly convert timezone or generate a UUID for a hotfix branch.

How it compares

ToolOfflinePrivacySetupCost
This toolYes100% localNoneFree
Server toolsNoMay log IPNoneFree/Ads
CLI / IDE pluginYesLocalInstall & configFree

For quick checks without context switching, the browser tool is fastest. For CI, keep the CLI as source of truth.

Pro tips

  • Bookmark the tool. With prefetch enabled, it opens near-instantly next time.
  • For secrets like hashes with salts, prefer your local terminal for production values.
  • Pair UUID/Password generators with your password manager for rotation workflows.

FAQ

What is a UUID v4?

A UUID (Universally Unique Identifier) is a 128-bit number shown as 36 characters, like 123e4567-e89b-12d3-a456-426614174000. Version 4 UUIDs are generated from random numbers, so two UUIDs produced independently are effectively guaranteed to be different — even across different devices.

How do I generate multiple UUIDs at once?

Set the quantity field to the number of UUIDs you need (up to 100 per batch), click Generate, and each UUID appears on its own line. Then use the Copy button to grab all of them at once.

Are the generated UUIDs really unique?

Yes, for practical purposes. Version 4 UUIDs use 122 bits of randomness from the browser's cryptographic random number generator, so the chance of collision is negligible — far smaller than the odds of winning the lottery twice.

Is it safe to paste production secrets?

Local processing is safer than server tools, but avoid pasting real production secrets anywhere.

Does this work offline?

Yes. After the first load the tool works without network.

Can I use this on mobile?

Yes. All developer tools are responsive and work on phones.

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