Skip to content
SmaftyTools

UUID Generator

Generate cryptographically random version 4 UUIDs — one or a thousand at a time, with uppercase and no-dash options. Free and instant.

UUIDs (version 4)

About UUID Generator

The UUID Generator creates version 4 UUIDs — 128-bit identifiers with 122 bits of cryptographic randomness — one at a time or in batches up to 1,000. Options for uppercase output and dash removal cover the formats different databases and APIs expect.

UUIDs (also called GUIDs) are the standard way to generate unique IDs without a central authority: database primary keys, request IDs, file names, API keys and distributed systems all rely on them.

Generation uses your browser's Web Crypto API (crypto.randomUUID), the same quality of randomness used for cryptographic keys — not Math.random().

How to Use the UUID Generator

  1. Set how many UUIDs you need (1–1,000).
  2. Toggle uppercase or dash-free formatting if required.
  3. Click Generate, then Copy all to grab the list.

Features

  • Cryptographically random version 4 UUIDs
  • Batch generation up to 1,000 at once
  • Uppercase and no-dash output options
  • One-click copy of the whole list

Frequently Asked Questions

Can two generated UUIDs collide?

Practically no. With 122 random bits, you'd need to generate about 2.7 quintillion UUIDs to reach even a 50% chance of a single collision — it's safe to treat them as unique.

What's the difference between UUID and GUID?

They're the same thing — GUID (Globally Unique Identifier) is Microsoft's name for UUID. The 8-4-4-4-12 hex format is identical.

Is the UUID Generator free?

Yes, the UUID Generator is completely free with no usage limits. No signup, no account and no installation required.

Is my data safe?

Yes. All processing happens locally in your browser using JavaScript — nothing you type is uploaded or stored on our servers.

Related Tools

Password Generator

Generate strong, random passwords with custom length, uppercase, numbers and symbols. Secure client-side generation — nothing leaves your device.

Hash Generator

Generate SHA-256, SHA-384, SHA-512 and SHA-1 hashes from text using the Web Crypto API. Fast, free and fully client-side.

Barcode Generator

Generate Code 128 barcodes from text or numbers and download as crisp SVG. Free client-side barcode maker — no watermark, no upload.