Contact
One address for everything. Replies usually take one or two working days.
Reporting a bug
Include the tool name or URL, a small input that shows the problem, what you expected, and what happened instead. Screenshots help. Please strip anything secret from the sample first.
Requesting a tool
Tell us the input, the output, and where you currently do the job. Requests that fit the "paste in, result out, runs in the browser" model get built first.
Advertising and partnerships
Ad placements are fixed-size, below the tool and after the article, and never over the editor. Write with the same address and the subject line "Advertising".