Contact us
We read every message. Email is the best way to reach us.
Helpful details to include
- Which tool you used and what you expected to happen.
- Your browser and device (for example “Chrome on Windows” or “Safari on iPhone”).
- For a calculator question, the inputs you used — please don’t send your Social Security number or other sensitive identifiers.
Please don’t email us confidential documents. We don’t need your file to investigate most problems; a description, or a similar test file without private information, is enough.
Privacy requests
To exercise privacy rights described in our Privacy Policy, email us with the subject “Privacy request”.
Security reports
If you find a security issue, email us with the subject “Security” and give us reasonable time to fix it before disclosing it. See security.txt.
We don’t offer a contact form because it would need a server that stores messages; email keeps things simple. Business address: [mailing address, if any].