💻 Developer Tools
UUID Generator
Generate UUID v4 identifiers instantly — single or bulk, with copy-all support.
How the UUID Generator works
This tool generates UUID version 4 identifiers using the browser's built-in crypto.randomUUID() API, which provides cryptographically secure random values. UUID v4 is the standard for generating unique IDs in web applications, databases, and distributed systems. Set the count to generate up to 100 UUIDs in one click, choose your preferred format (lowercase, uppercase, no hyphens, or with braces), and copy individually or all at once.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. It is formatted as 32 hexadecimal characters in 5 groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What is UUID v4?
UUID v4 is randomly generated — all 128 bits are random (with 6 bits reserved for version/variant flags). It is the most commonly used version because it requires no coordination between systems — each generation is statistically unique.
How unique is a UUID v4?
UUID v4 has about 5.3 × 10^36 possible values. The probability of generating two identical UUIDs is astronomically small — you would need to generate about 2.7 quintillion UUIDs before having a 50% chance of even one collision.
How do I generate a UUID in JavaScript?
In modern browsers and Node.js 19+: crypto.randomUUID(). This generator uses that API for cryptographically secure output.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's name for UUID. They follow the same RFC 4122 standard and are interchangeable — a GUID is a UUID, just with a different name.
Is this UUID generator free?
Yes — the UUID Generator on Potential Daily is completely free with no sign-up required. All UUIDs are generated in your browser using cryptographically secure randomness — nothing is sent to a server.