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.
- Does it handle very large numbers?
- Yes, exactly and without a size limit. Most online converters use ordinary JavaScript numbers, which lose precision above about 9 quadrillion - so a 64-bit hex value, exactly the kind of thing people paste into a base converter, comes back silently wrong. This uses arbitrary-precision integers.
- Can I paste 0x or 0b prefixes?
- Yes. Prefixes, underscores and spaces are all accepted and ignored, so you can paste a value straight out of code.
- What is base 36?
- Digits 0-9 followed by letters a-z, which is the most compact way to write a number using only alphanumerics. It shows up in short URLs and identifiers.
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.