All tools
Developer

UUID Generator

Generate one or many RFC 4122 v4 UUIDs.

🔒 Runs entirely in your browser — nothing here is ever uploaded

About the UUID Generator

Generates one or many random UUIDs (Universally Unique Identifiers) in the standard version-4 format, commonly used as unique IDs for database records, API resources, and distributed systems.

How to use it
  1. Enter How many UUIDs to generate.
  2. Click Generate.
  3. Copy any UUID with its copy button.
Formula
Uses your browser's crypto.randomUUID() function, generating a 128-bit value formatted as 32 hex digits split into 5 groups, with fixed bits marking it as version 4.
Worked example

A typical generated UUID looks like f47ac10b-58cc-4372-a567-0e02b2c3d479.

Recommendations
  • • The collision probability for two random v4 UUIDs is astronomically small — practically safe to treat as unique without central coordination.
  • • Generate multiple at once to quickly seed test data or placeholder records.
  • • UUIDs aren't sequential or sortable by creation time — a timestamp-prefixed ID scheme would suit that need better.
Frequently asked questions
Version-4 UUIDs have 122 random bits, giving an astronomically low collision probability — billions would need generating before duplicates became a practical concern.
Related tools
Password Generator
Hash Generator
Check Digit Validator
Sources