Are the tools really free?
Yes. Every tool is completely free with no sign-up, account, or usage limit.
Is my data private?
Yes. Calculations run in your browser. The values you enter are not sent to or stored on our servers.
How accurate are the results?
Tools use standard formulas and current references, and each page explains the method. Still, results are estimates for reference; consult a professional for important decisions.
Do I need to install anything?
No. Everything runs in your web browser on phone, tablet, or desktop.
What languages does utilduck support?
utilduck is available in nine languages: English, Korean, Japanese, Chinese, German, French, Spanish, Vietnamese, and Indonesian. Switch languages from the menu at the top of any page.
Can I use utilduck on a phone or tablet?
Yes. Every tool is built as a responsive web page that works the same way on phones, tablets, and desktops. There is nothing to download from an app store.
Does utilduck show ads?
Some pages display ads served through Google AdSense to help cover hosting costs. Ads never block the calculator itself, and you can manage ad personalization in your Google account settings.
How do I request a new tool?
Email contact@utilduck.com with the calculator or converter you would like to see. We read every suggestion, though we cannot guarantee a timeline for building it.
I found an error — how do I report it?
Email contact@utilduck.com with the tool name and what looked wrong, ideally with the input values you used. We check every report and fix confirmed errors.
Can I bookmark a tool or use it offline?
You can bookmark any tool page and it will load the same way each time. Offline use is not supported yet, since each page needs to load once from the server before it runs in your browser.