UUID Generator
Frequently Asked Questions
Everything you need to know about UUIDs
What is a UUID?
UUID (Universally Unique Identifier) is a standard 128-bit identifier used in computing to uniquely identify resources without the need for a central authority. It is represented as 32 hexadecimal digits in 5 groups separated by hyphens.
What does UUID v4 mean?
UUID v4 is randomly generated. It uses 122 random bits and 6 fixed bits that identify the version and variant. The probability of collision is astronomically low: it would take billions of UUIDs generated per second for tens of years to have a concrete probability of duplicates.
When should I use a UUID?
UUIDs are ideal as primary keys in distributed databases, session identifiers, transaction IDs, temporary file names and any context where a unique ID is needed without centralised coordination. They are preferable to incremental IDs to avoid predictability.
Does my data stay private?
Yes, and not because we promise it: this tool runs entirely inside your browser. What you type or upload never leaves your device, so it never reaches a server of ours and there is nothing we could keep, read or lose. You can check it yourself: open the page, disconnect from the internet, and the tool keeps working.
Do you store what I enter?
No. There is no database behind this tool: we do not store your files, your text or your results. When you close the tab nothing is left — not here with us, because it never arrived, and not anywhere else.
Do you profile me? Are you GDPR compliant?
We do not profile you: there is no account to create, we never ask for your email to use a tool, and we keep no profile of what you do. We are an Italian company and we work under the GDPR and the other European rules, with the privacy notice and the consent request in plain sight. One thing we say in full rather than hiding it behind a slogan: the ads on the page are Google's, and Google may use cookies to personalise them. You decide from the consent banner: if you say no the ads stay, but they are not personalised, and the tool works exactly the same.
If it is free, how do you make money?
From the ads on the page, and that is all. We do not sell your data, there is no hidden paid plan, there is no limit that eventually asks for your card, and you do not have to sign up. The ads pay for the servers and for the time we spend writing the tools: that is how we can keep them open to everyone.