Contact

Last updated: October 27, 2026

We read every message. For the fastest response, use the email address below and include the page URL if your message is about a specific tool.

Bug reports — tell us the tool, your browser, and what you expected to happen.

Content corrections — if a figure, rule, or citation is wrong or out of date, include the source you are comparing against.

Privacy requests — access, correction, or deletion requests under GDPR or CCPA. See our Privacy Policy.

Partnerships — advertising and affiliate enquiries.

Please don't send us files

Please do not email us files you have processed with our tools, or anything containing sensitive personal information. We do not need them to investigate a bug, and we do not want to hold them.

If you are reporting a security issue, please include “security” in the subject line.