UtilTools

UUID Generator

Bulk v4, v7 and NIL UUIDs from a real CSPRNG.

UUID Generator produces version 4 random UUIDs and version 7 time-ordered UUIDs in bulk, using crypto.getRandomValues for the randomness. Output can be uppercase, braced, hyphenless, or wrapped as a quoted list for pasting into code. Everything is generated on your device.

Loading UUID Generator…

Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.

How to use UUID Generator

  1. Choose the version and how many you need.
  2. Pick a format — plain, uppercase, braced or quoted list.
  3. Copy or download the batch.

Questions about UUID Generator

What is UUID v7 and why would I use it?
A UUID whose first 48 bits are a Unix millisecond timestamp, so v7 values sort chronologically. That makes them far better than v4 as database primary keys, because they append to a B-tree index instead of scattering writes across it.
Could two v4 UUIDs collide?
Not in practice. With 122 random bits, you would need to generate about 2.7 × 10¹⁸ of them before a 50% chance of a single collision. The randomness comes from the operating system CSPRNG, not Math.random().
Are the UUIDs generated here private?
They are generated in your browser and never transmitted. A generator that produced identifiers on a server would mean someone else knows every ID you use.
How many can I generate at once?
Batches of several thousand come out without a noticeable pause and can be downloaded as a text file. Much larger batches still work, but the whole list has to sit in browser memory before you copy it.
Do I need an account or an API key?
No. There is no sign-up, no key and no rate limit, because there is no server in the loop — the values come from the CSPRNG already built into your browser.
Is UUID Generator really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use UUID Generator?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.