Enter 1–100 UUIDs to generate
A UUID (Universally Unique Identifier) is a 128-bit identifier that is used to uniquely identify information in computer systems. UUIDs are designed to be globally unique with such a high probability that they can be assumed unique across all systems without requiring a central registry or coordination. The UUID version 4 (v4), the most common variant, is generated using random numbers. With 122 random bits, the collision probability is negligible—even when generating billions of UUIDs, the chance of accidental duplicates remains astronomically small. Unlike sequential IDs or those tied to specific machines, UUID v4 ensures privacy and security by never revealing information about generation time or location. UUIDs are represented as a 36-character string in the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is any hexadecimal digit and y is one of 8, 9, A, or B.
Enter the number of UUIDs you need (between 1 and 100), then click the Generate button. The tool instantly creates unique UUID v4 identifiers using the browser’s native crypto.randomUUID() API. All UUIDs are generated locally in your browser—your data never leaves your device and remains completely private. Copy all generated UUIDs to your clipboard with a single click, or copy them one at a time as needed. The tool is ideal for developers, DevOps engineers, database administrators, and anyone else who needs quick, reliable UUID generation without external API calls or dependencies.
The UUID standard (RFC 9562, which obsoletes RFC 4122) defines five main versions:
This tool generates UUID v4 identifiers, which are the most widely used because they offer maximum privacy and require no external state or coordination. With 122 random bits, UUID v4 provides sufficient uniqueness for virtually any distributed system.
The probability is astronomically small. UUID v4 uses 122 random bits, resulting in 2122 possible unique values. Even if you generated one billion UUIDs per second for the next 100 years, the probability of a collision would still be negligible. For all practical purposes, UUID v4 guarantees global uniqueness.
GUID (Globally Unique Identifier) is Microsoft’s term for what the broader industry calls a UUID. They are functionally equivalent, though GUIDs sometimes use a different byte order. Today, UUID is the standard term used across platforms, and RFC 9562 is the definitive specification.
Yes. This tool uses the browser’s nativecrypto.randomUUID() API, which is cryptographically secure and suitable for production use. All major modern browsers support this API. No external libraries or network calls are required. Your data never leaves your device.