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UUID Generator

Generate cryptographically secure UUID v4 identifiers in bulk. Customize format with uppercase, hyphens, and braces options. All client-side, no server involved.

Generator Tools Runs locally No data sent
UUID v4 crypto.randomUUID bulk generation client-side only
Number of UUIDs
1100
10
Format Options
✓
Uppercase A-F
✓
Include hyphens xxxxxxxx-xxxx—
✓
Wrap in braces {—
Generated UUIDs
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UUIDs are generated using crypto.randomUUID() (with a polyfill via crypto.getRandomValues() for older browsers). UUID v4 is entirely random —the probability of a collision is astronomically small (~1 in 10³⁀. Nothing is ever logged or sent anywhere.

What is UUID Generator?

Generate UUID v1 and v4 identifiers in bulk. Copy one value or the entire list at once, all locally in your browser.

How to Use UUID Generator

  1. Pick UUID v1 or v4 depending on whether you need time-based or random identifiers.
  2. Set the quantity you want to generate.
  3. Generate the list instantly in your browser.
  4. Copy a single UUID or copy the full batch at once for scripts, fixtures, or spreadsheets.

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Understand UUIDs ▾
Example
Input v4, "qty": 1
Output f47ac10b-58cc-4372-a567-0e02b2c3d479
Common Use Cases
  • Generate sample IDs for databases and APIs
  • Create unique keys for test fixtures and demos
  • Seed mock data locally without a server dependency
  • Copy batches of UUIDs for scripts or spreadsheets
Frequently Asked Questions
What is the difference between UUID v1 and v4?

v1 is time-based and includes the MAC address of the generating machine. v4 is completely random. v4 is preferred for privacy.

Are generated UUIDs unique?

UUID v4 has 122 bits of randomness, making collisions statistically negligible for all practical purposes.

Can I generate UUIDs in bulk?

Yes. Use the quantity slider to generate up to 100 UUIDs at once, then copy all with one click.

v1

v1 is time-based: it encodes the current timestamp and the machine's MAC address, making it sortable by creation time but potentially revealing system information. v4 is purely random and the recommended default for most applications.