How to Fix PDF Email Attachments That Will Not Open
Question details
Users or developers are unable to open generated PDF files sent as email attachments due to error messages indicating file corruption or invalid formats.
- Product
- Device & OS
- not provided
- Scenario
- Attempting to download and open a PDF file that was generated and attached to an email.
- Observed behavior
- The PDF attachment fails to open in the viewer, displaying an error message that the file is corrupted, truncated, or has an invalid format.
Download the problematic PDF attachment to your local computer rather than trying to open it directly within your email client or web browser previewer.
Save Locally and Verify File Integrity
Determine if the issue is with the email client's previewer or if the downloaded file is actually empty or corrupted.
Often, email clients struggle to preview certain generated PDFs. Saving the file locally helps isolate whether the file itself is broken or if the email software is just failing to render it.
Click the download icon next to the PDF attachment in your email client and save it to your Desktop or Downloads folder.
Right-click the downloaded file and select 'Properties' (Windows) or 'Get Info' (Mac). If the file size is 0 KB or unusually small, the file was truncated during generation or transmission.
Open the saved file using a dedicated PDF application rather than a web browser to see if it renders correctly.
Troubleshoot Email Generation and Encoding
For developers and automated system senders: fix backend code issues that cause PDF attachment corruption during email delivery.
Open and Manage PDF Attachments Safely with WPS Office
WPS Office features a robust built-in PDF reader that handles various PDF encodings effortlessly. If your browser or default email viewer struggles to open an attachment, WPS Office provides a lightweight, highly compatible alternative to render standard and complex PDFs seamlessly.
- 1. Download WPS Office: Visit the official WPS website to download and install WPS Office for free on your device.
- 2. Save the PDF locally: Download the problematic PDF email attachment to your computer's local storage.
- 3. Open with WPS PDF: Right-click the saved PDF file, hover over 'Open with', and select WPS Office from the list of applications to view your document.
Frequently Asked Questions
Why does my PDF attachment say it is corrupted?
This usually happens due to email encoding errors, an interrupted download, or if the system that generated the email applied the wrong MIME type, causing the file structure to break.
How do I check if an attached PDF is actually empty?
Download the file to your computer, right-click it, and check its properties. If the file size is 0 bytes or just a few bytes, the file is empty or was severely truncated.
What is the correct MIME type for sending PDF attachments?
The correct MIME type for PDF files in email headers and web delivery is 'application/pdf'. Using generic types like 'application/octet-stream' can sometimes cause email clients to misinterpret the file.
Can my email provider block or alter PDF attachments?
Yes. Strict security filters on some email services may alter or quarantine attachments if the encoding is malformed or if they suspect the file contains malicious scripts.
