Contact channel
Email is the primary support channel: qxuan2025@gmail.com
Do not send confidential PDF files, passwords, private keys or seal images by email unless a secure exchange has been agreed in advance.
How to report an issue
A complete report makes reproduction much faster. Please include the information below where it is relevant.
- The page URL or the exact tool workflow you were using.
- The time of the issue and your time zone.
- Your browser name and version, operating system, and device type.
- PDF characteristics such as page count, whether it is scanned, password-protected or unusually large. Do not send the file unless requested.
- Clear steps, expected result, actual result, and a redacted screenshot if available.
How requests are handled
Messages are reviewed manually. Privacy, security, broken core workflows and copyright reports are prioritised. We may ask for clarification, reproduce the issue with non-confidential test files, and publish a fix or guidance when appropriate.
There is no guaranteed response-time SLA. Requests that require legal interpretation, remote access to confidential documents, identity verification or certificate services are outside the support scope.