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UUID Generator

Generate random UUIDs (v4) instantly. Create one or many unique identifiers with a single click.

UUIDs (Universally Unique Identifiers) are 128-bit values used across software development for database primary keys, session tokens, API identifiers, and distributed system coordination. Version 4 UUIDs are randomly generated, providing a practically zero chance of collision.

This generator creates cryptographically random UUIDs using the Web Crypto API. Generate one or up to 100 at a time, with options for uppercase formatting and hyphen removal. Everything runs in your browser with no data sent to any server.

Generator

Results

How to Use

  1. Set the number of UUIDs to generate (1-100)
  2. Optionally enable uppercase or remove hyphens
  3. Click Calculate to generate
  4. Copy the UUIDs from the output

FAQ

What version of UUID is generated?

This tool generates version 4 UUIDs, which are randomly generated using cryptographically secure random numbers.

Are these UUIDs truly unique?

Yes. UUID v4 uses 122 random bits, making the probability of a collision astronomically small — you would need to generate billions of UUIDs per second for decades to have a 50% chance of one collision.

Is this tool secure for production use?

Yes. It uses the browser's crypto.getRandomValues() API, which provides cryptographically secure random numbers.

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Learn More

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Developer Utilities: The Browser-Based Toolkit

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Every developer has a set of go-to utilities they reach for daily — formatting JSON, testing regex patterns, generating UUIDs, hashing strings, or decoding Base64. This collection brings those essentials together in one place so you can stop searching and start building.