Web Dev Tools

UUID / GUID Generator

Generate random UUIDs (Universally Unique Identifiers) instantly. Supports UUID Version 4 (Random), bulk generation, uppercase/lowercase, and custom counts.

Use UUID / GUID Generator to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.

Your results will appear here.

Ready to run.

About this tool

A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. They are so unique that the probability of generating two identical ones is practically zero.

This tool generates Version 4 UUIDs, which are based on strong random numbers (using your browser's crypto API). These are the standard for database keys, user sessions, and transaction IDs.

Developers use UUIDs to ensure that database records never collide, even when generated on different servers at the same time.

Usage examples

Standard V4 UUID

Lowercase, hyphens

a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11

Uppercase GUID

Windows style

A0EEBC99-9C0B-4EF8-BB6D-6BB9BD380A11

How to use

  1. Select the version (Default: Version 4 Random).
  2. Choose how many UUIDs you want (1 to 500).
  3. Toggle "Uppercase" or "Braces" if needed.
  4. Click "Generate" to create new IDs.
  5. Click "Copy" to save them to your clipboard.

Benefits

  • Generates cryptographically secure UUIDs (v4)
  • Bulk generation (up to 500 at once)
  • Custom formatting (Hyphens, Braces, Case)
  • No server interaction (100% private)
  • Instant Copy to Clipboard
  • Works offline

FAQs

What is UUID v4?

Version 4 UUIDs are generated using random numbers. Unlike Version 1 (which uses time and MAC address), v4 relies on pure randomness. This is preferred for security and privacy.

Can UUIDs collide?

Theoretically, yes. Practically, no. The number of possible UUIDs is so large (2^128) that you could generate 1 billion UUIDs every second for the next 100 years and still have a negligible chance of a duplicate.

What is a UUID used for?

UUIDs are used as unique identifiers in databases, APIs, file systems, and distributed systems. They ensure uniqueness without requiring central coordination.

Can I generate UUIDs without hyphens?

Yes, disable the "Include Hyphens" option to generate UUIDs in compact format (32 hex characters without dashes).

What is the difference between UUID and GUID?

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are the same thing. GUID is Microsoft's term for UUID. They follow the same RFC 4122 standard and are interchangeable.

Are the UUIDs cryptographically secure?

Yes, this tool uses the browser's crypto.getRandomValues() API which provides cryptographically strong random numbers. These UUIDs are safe for security-sensitive applications like session tokens and API keys.

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