Is ZetTool really free?
Yes. Every tool on ZetTool is free to use, with no sign-up, account or hidden paywall.
Do you store the data I enter?
Almost all calculators run entirely in your browser — your numbers, text and files are not uploaded to ZetTool’s servers. The Online Notepad saves only to your own browser's local storage.
Why did a page 404 for me earlier?
If you reached ZetTool from an old bookmark or a search result during a recent update, that link may have changed. Use the search or the All Tools page to find the current version.
Can I suggest a new tool?
Yes — email mirzanayab18@gmail.com with what you'd find useful. We review every suggestion.
Are the calculators accurate enough for official use?
They're built for everyday estimates and general information. For legal, financial or medical decisions, always confirm with a qualified professional or the official source's own method.