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UUID Generator

Generate random UUIDs (v4).

Free to use, no sign-up required. UUID Generator is one of 198 tools built into Xenition, alongside a chat that can use them for you.

Generates random version 4 UUIDs, from 1 to 1,000 at a time. Developers use them as database keys, request IDs and file names that must not collide.

How to use UUID Generator

1. Enter how many you need in the “How many (1–1000)” box; it starts at 5.
2. Tap any single UUID to copy it.
3. Press Copy all to copy the list, one per line, or Download to save it as a text file.
4. Press Regenerate for a fresh set.

How it works

The tool uses the browser’s crypto.randomUUID. Where that is unavailable it fills 16 random bytes from crypto.getRandomValues and sets the version bits to 4 and the variant bits to 10, which leaves 122 random bits in each ID.

Example

Each result has the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx: 32 hexadecimal digits in groups of 8, 4, 4, 4 and 12, where the third group always starts with 4 and y is 8, 9, a or b. Downloading 5 saves uuids-5.txt.

Questions about UUID Generator

Can two v4 UUIDs ever be the same?

In theory yes, but with 122 random bits you would need to generate about 2.7 × 10^18 of them to reach a 50% chance of a single repeat.

What is the difference between UUID v4 and v7?

Version 4 is entirely random. Version 7 starts with a timestamp so IDs sort by creation time, which some databases index more efficiently.

Use it from chat

You do not have to open UUID Generator to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

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