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UUID Generator Online — Free Tool

Generate cryptographically secure version 4 Universally Unique Identifiers (UUIDs) instantly.

Settings
Runs locally in your browser (no server).
UUIDs
Click Generate…
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

UUIDs (Universally Unique Identifiers) are 128-bit values used as database keys, correlation IDs, and session tokens. Version 4 UUIDs are random and collision-resistant for practical purposes.

Generate one or many v4 UUIDs instantly in the browser for development and testing.

Common use cases

  • Primary keys in distributed databases
  • Request correlation IDs in microservices
  • Mock data and test fixtures
  • Client-side entity IDs before server sync

How to use

  1. Choose how many UUIDs to generate.
  2. Click generate to create version 4 identifiers.
  3. Copy a single UUID or the full list.
  4. Paste into code, config, or database seed scripts.

This page is available at /tools/uuid-generator/.

Understanding the result

  • Standard format: 8-4-4-4-12 hex digits with version nibble 4 in the third group.
  • Collisions are astronomically unlikely for single-app volumes; still use DB constraints in production.
  • UUIDs are not secret—do not use alone for authorization tokens.
  • Lowercase versus uppercase hex is cosmetic; normalize in your storage layer.

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FAQ

What is UUID v4?

A randomly generated UUID per RFC 4122. Unlike v1, it does not embed MAC address or timestamp.

Can I generate bulk UUIDs?

Yes. Generate many at once for test datasets or migrations.

UUID vs GUID?

GUID is Microsoft's term; v4 UUID and GUID refer to the same string format in practice.

Are UUIDs secure session tokens?

Use long cryptographically random tokens designed for security. UUID v4 is fine for IDs, not ideal alone for secrets.