UUID v4 Generator

About This Tool

Generate low-collision UUID v4 identifiers in bulk using cryptographically secure randomness—ideal for test data or issuing unique keys manually. All processing happens in your browser (no data is transmitted).

UUID Generator

Use cases

  • Create IDs for sample data or assign values in CSV files
  • Issue unique keys manually

Basic usage

  1. Enter the quantity → press Generate → copy everything at once.
How UUIDs work and why they matter (click to expand)

UUID (Universally Unique Identifier) is a 128-bit value, typically shown as 8-4-4-4-12 hexadecimal segments (e.g., 550e8400-e29b-41d4-a716-446655440000). It is designed so that even simultaneous generation on multiple machines results in an extremely low collision probability.

Representative versions
  • v1: timestamp + MAC address, etc.
  • v4: cryptographically secure randomness (this tool)
  • v5: namespace hash (same input → same UUID)
Where is it useful?
  • Database primary keys: great for sharding
  • Filenames / URL keys: collision-resistant naming
  • Session / transaction IDs
  • Asset or serial IDs: no complex numbering rules required
  • Public-facing IDs: keep internal structure hidden

Generation method: UUID v4 (cryptographically secure randomness). Uses the browser's crypto.getRandomValues API.