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Reporting a wrong result

This is the report worth the most. Tools run entirely in your browser, so nothing about your session reaches us and we cannot look up what happened — the message has to carry enough for us to reproduce it. Please include:

• the address of the tool page;
• exactly what you entered, including the units and any options you changed;
• what the tool showed, and what you expected instead;
• where your expected figure comes from, if there is a source we can check against;
• your browser and operating system.

Never send a real password, an API key or a confidential document to illustrate a bug. If a file is involved, describe its type and size rather than attaching it — that is almost always enough to reproduce the problem.

Suggesting a tool

Say what you would do with it and what you would type in. Requests that describe a real task get built; requests for a keyword rarely do. Tools that would require uploading your data to a server are out of scope by design.

Privacy and legal

Data protection requests and questions about what the site collects are answered at the same address. The Privacy Policy probably answers the common ones already, and the Terms of Service cover use of the site.