Frequently asked questions
- Is my data uploaded to a server?
- No. Every operation runs inside your browser using JavaScript. Nothing you paste or type is sent to our servers, stored or logged. You can disconnect from the network after the page loads and the tool keeps working.
- Are these random enough to rely on?
- Yes. They come from crypto.getRandomValues, the browser's cryptographic random number generator, not from Math.random. A version 4 UUID has 122 random bits, so a collision is not something you will see.
- What is the difference between UUID versions?
- Version 4 is random. Version 1 encodes a timestamp and the machine's MAC address, which leaks information and is why it is rarely used now. This generates version 4.
Related tools
Stuck on an error?
Every common JSON parse error is explained separately, with the cause and the fix: common JSON errors.
How your data is handled
Everything happens on your device. There is no upload, no storage and no logging, and only your interface preferences - theme, indentation, font size and word wrap - are kept between visits. Closing the tab clears the document.