UUID Generator — Random v4 and Time-Ordered v7

Generate random UUID v4 or time-ordered v7 identifiers in bulk, in the format you need. Free, no sign-up, and your files never leave your device.

Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.

Generate up to 1,000 UUIDs at once. v4 UUIDs are fully random; v7 UUIDs start with the current time, so they sort in creation order — better for database primary keys. Output formats include lowercase, UPPERCASE, no hyphens, {braces} (Microsoft GUID style) and URN.

Step by step

  1. Choose the version: v4 (random) or v7 (time-ordered).
  2. Set how many: 1 to 1,000.
  3. Pick a format: Standard, UPPERCASE, no hyphens, braces or URN.
  4. Copy or download: Copy all, Download, or Generate new for a fresh batch.

Handy for

Database keys

v7 keeps indexes compact because new IDs are always increasing.

Test data

Bulk IDs for fixtures and seeds.

Correlation IDs

Tag requests and logs.

Windows GUIDs

Braced format for registry or COM work.

Good to know

  • UUIDs come from your browser's cryptographically secure random generator.

  • v7 reveals roughly when an ID was created; use v4 if that matters.

Questions

Can two UUIDs ever clash?

With 122 random bits (v4), the chance is so small it is ignored in practice — you'd need billions of IDs per second for decades.

Is my data sent anywhere?

No. Everything is processed by JavaScript in your browser tab — nothing you paste or open is uploaded, logged or stored on a server. You can even use the tool offline once the page has loaded.

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