UUID Generator

Generate cryptographically secure v4 UUIDs using crypto.randomUUID(). Bulk generate, copy, or download.

Count:
Generated UUIDs (1)
ac98c67c-89b7-427d-9e3e-3fd8c39c1177

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value represented as a 36-character string used to uniquely identify information in computer systems. UUID version 4 (v4) is the most common variant, generated entirely from cryptographic randomness with no dependency on hardware or timestamps.

550e8400-e29b-41d4-a716-446655440000
—No database dependency: Generate unique IDs entirely client-side without hitting a database.
—Distributed systems: Avoid collisions across multiple services or nodes.
—API identifiers: Assign unique request IDs or resource handles.
—Bulk test data: Seed databases with large sets of unique identifiers.

Key Features

✓UUID v4 generation — Uses crypto.randomUUID() for cryptographically secure output
✓Bulk generation — Generate 1–100 UUIDs in a single click
✓Copy all — Copy the entire list to clipboard instantly
✓Uppercase / lowercase — Toggle output casing to match your codebase style
✓Per-item copy — Hover any UUID to copy it individually
✓100% client-side — No network requests — your data never leaves the browser

How to Use the UUID Generator

  1. 1Set the count: Enter how many UUIDs you need (1–100) using the count input.
  2. 2Choose formatting: Toggle uppercase if your system requires uppercase identifiers.
  3. 3Generate: Click the Generate button to create all UUIDs instantly.
  4. 4Use the output: Copy all UUIDs at once, or hover any individual UUID to copy it separately.

Common Use Cases

Database Primary Keys

Use UUIDs instead of auto-increment IDs to ensure globally unique records across environments and services.

Distributed Systems

Guarantee uniqueness across multiple services, nodes, or data centres without coordination.

API Development

Assign unique request trace IDs, correlation IDs, or resource identifiers.

Testing & Mock Data

Bulk-generate hundreds of unique values to seed test databases or fixtures.

Session & Token IDs

Use UUIDs as temporary identifiers in stateless authentication or session management.

Event Sourcing

Assign globally unique IDs to events in event-driven or CQRS architectures.

Benefits for Developers

  • →No backend dependency: ID generation happens entirely in the browser — no API calls needed.
  • →Secure randomness: crypto.randomUUID() uses the Web Crypto API, the same source used for cryptographic operations.
  • →Practically collision-free: The probability of two v4 UUIDs colliding is negligibly small for any real-world workload.
  • →Highly scalable: Suitable for distributed architectures where centralised ID sequences would create bottlenecks.
  • →Fast bulk generation: Generate 100 UUIDs in milliseconds for testing workflows.
  • →Privacy-friendly: All processing is local — sensitive system context never leaves your machine.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. It is represented as a 32-character hex string separated by hyphens.

What is UUID v4?

UUID v4 is a randomly generated UUID. Unlike other versions, it does not depend on hardware addresses or timestamps — it is derived entirely from cryptographic random numbers.

Is this tool secure?

Yes. It uses the browser's crypto.randomUUID() API, which is cryptographically secure and suitable for production use.

Can UUIDs collide?

The probability of collision is astronomically low. With v4 UUIDs you would need to generate approximately 2.7 quintillion UUIDs before a 50% chance of collision — completely negligible in practice.

Is this tool free?

Yes. The UUID Generator on NexoraTools is completely free with no sign-up or restrictions.