UUID Generator
Generate cryptographically random UUIDs - version 4, or version 7 for time-sortable ids.
Fill in the form and press “Generate UUIDs” to see the result here.
How to use it
- 1Choose how many identifiers you need and which version.
- 2Press Generate. New values are produced every time.
- 3Copy the list, or download it as a text file.
About the UUID Generator
Version 4 is 122 bits of randomness from your browser’s cryptographic generator. You would need to generate about 2.7 × 10¹⁸ of them before a collision became likely, so for practical purposes they are unique without coordination.
Version 7 puts a 48-bit millisecond timestamp in the leading bits, so the values sort chronologically as plain strings. That keeps database B-tree indexes sequential, which is the main practical argument against v4 as a primary key.
Values are generated in your browser and never transmitted, which matters if the ids will become record identifiers.
Questions people ask
Is your code uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your code never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.