UUID Generator
Generate single or bulk cryptographically secure random UUIDs (v4).
Single UUID Identifier
Bulk UUID Generation
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems. For practical purposes, UUIDs are unique without requiring a central registration authority. Version 4 UUIDs are completely random and are generated using cryptographically strong pseudorandom numbers, making them the industry standard for unique database keys, transaction identifiers, and session tokens.
How it Works
A UUID v4 is represented as a string of 32 hexadecimal digits, divided into five groups separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The "4" at the start of the third group indicates it is a version 4 UUID, and the "y" indicates the variant (usually 8, 9, a, or b). Our tool utilizes the browser's cryptographically secure random number generator (crypto.getRandomValues or crypto.randomUUID) to generate UUIDs. This guarantees true randomness and eliminates duplication risk. You can generate a single UUID or generate up to 500 UUIDs in bulk, customize the output (casing and hyphen inclusion), and download the output as a text file.
Probability of Collision
The total number of possible UUIDs is 2122 (approximately 5.3 x 1036). The probability of finding a collision is so infinitesimally small that even if you generated billions of UUIDs every second for a hundred years, the chance of a collision would still be near zero.
Frequently Asked Questions
This generator creates Version 4 UUIDs, which are generated using cryptographically strong random numbers. This is the most common version used for database IDs and identifiers.
Yes, for all practical purposes. A UUID v4 contains 122 bits of randomness. The probability of generating two identical UUIDs is so low that it would take billions of years of continuous generation to have even a tiny chance of collision.
Yes, you can generate up to 500 UUIDs in a single click. You can copy the entire list to your clipboard, clear it, or download the generated list as a plain text file (.txt).
You can toggle between lowercase and uppercase characters, and choose whether to include or exclude hyphens (dashes) between the hexadecimal segments.
Yes. It uses the Web Crypto API (crypto.getRandomValues or crypto.randomUUID) supported by modern browsers, which uses the operating system's entropy pool to ensure high-quality randomness.