Contact

OnlineToolKit is maintained by a solo developer. Feedback, bug reports and tool requests are genuinely welcome — they determine what gets built next.

What to include in a bug report

Which tool page (the URL helps)
What you entered
What you expected vs what happened
Your browser and device, if relevant

Tool requests

If a tool you need isn't here yet, describe the calculation or conversion and it may well appear in a future update. Requests for developer and business calculators are especially likely to be built.

Response time

This is a one-person project, so replies may take a few days. Every message is read.

Note: because the tools run entirely in your browser, no data you enter is ever sent to us — so we cannot recover lost input. Please keep a copy of anything important before using a converter.