Reporting a wrong result
A report that can be reproduced gets fixed. A report that cannot be reproduced usually ends in a round of questions, so please include all four of these:
For a file tool, a short description of the file is more useful than the file: its format, its rough size, and whether it holds images, tables or more than one writing system.
Please do not send
Email is not a secure channel, and this mailbox is an ordinary Gmail account. Do not attach confidential or sensitive material: contracts, medical records, identity documents, bank statements, passwords, API keys or private source code. If a problem only happens with one real document, recreate it with dummy text and send that instead.
There is no contact form
This site has no server that accepts submissions, so a form would have nowhere to send anything. Email is the only channel, and replies come from one person, so they are not immediate.
Reviewed October 1, 2026. Calculation methods and corrections · About this site.