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.
- Can I use these as API keys or tokens?
- Yes. They come from the browser's cryptographic random number generator with unbiased sampling, so every character is equally likely. For a token meant to resist guessing, use at least 22 characters from a mixed alphabet.
- What does avoiding lookalike characters do?
- It leaves out I, l, 1, O, 0 and similar pairs that are hard to tell apart in most fonts. It costs a little randomness and saves a lot of trouble when someone has to read the value aloud or copy it off a screen.
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.