UUID v4 uses 122 random bits, giving 2¹²² ≈ 5.3 × 10³⁶ possible values. The probability of generating a duplicate in 103 trillion UUIDs is roughly 1 in a billion. Uses the browser's crypto.randomUUID() API when available for cryptographic quality.
Reliable data generators save hours of manual work — whether you are building test datasets, generating unique identifiers, or producing random values for simulations. The UUID v4 Generator is Generate UUID v4 random identifiers — single or bulk — and it runs entirely in your browser with no data sent to any server. Whether you are a developer, data analyst, student, or technical user, this free tool removes friction from your workflow and gives you instant, accurate results every time. If you need to take the output a step further, try the UUID Generator — it handles the next stage of the workflow.
The UUID v4 Generator is a free, browser-based utility that generate uuid v4 random identifiers — single or bulk. It processes your input locally using JavaScript, which means all operations happen on your device — no uploads, no server processing, and no privacy concerns. The result is immediate, updating as you interact with the tool. Alternatively, if you are looking for something slightly different, the Random String Generator may be a better fit.
Tools like this are used every day by web developers, DevOps engineers, data scientists, security professionals, and content creators. The UUID v4 Generator belongs to this class of essential utilities that save time, reduce errors, and streamline everyday technical tasks.
There are many generic tool sites online, but the UUID v4 Generator on Chunky Munster is built with a developer-first mindset. Everything runs in your browser — there are no paywalls, no rate limits, no forced sign-ups, and no advertisements disrupting your concentration. For related work, the Random Number Generator is another popular tool worth bookmarking.
The UUID v4 Generator produces random or structured values on demand — useful for testing, development, placeholder data, and unique identifier generation.
Where possible, the tool uses the browser's built-in cryptographic random number generator (Web Crypto API) for maximum randomness.
Yes — free forever with no limits, no account, and all generation happening locally in your browser.
No. Generated values are created in memory and never sent to any server or stored anywhere.
The UUID v4 Generator is a free, private, and reliable tool for every developer and technical user. Bookmark this page for fast access, share it with your team, and explore the full collection of tools at Chunky Munster — all free, all browser-based, all yours. You might also find these related tools useful: UUID Generator, Random String Generator, Random Number Generator.