Fix Fill & Sign Option Missing When Opening a PDF from Email
Question details
The user is unable to locate the Fill & Sign option in the top-right menu when opening a PDF attachment directly from an email.

- Product
- PDF Editor
- Device & OS
- not provided
- Scenario
- Opening a PDF attachment directly from an email client to fill and sign the document.
- Observed behavior
- The Fill & Sign option does not appear in the menu, preventing the user from signing the document.
Ensure you have a dedicated PDF editing application installed on your device, as built-in email previewers typically lack advanced editing and signature tools.
Save and Open the PDF in a Dedicated PDF Editor
Email clients often open attachments in a restricted preview mode. Downloading the file ensures you can access full editing features.
When you click a PDF attachment in Microsoft Outlook or other email clients, it usually opens in a basic previewer to save time and memory. This preview mode does not support complex tools like Fill & Sign.
Open the email containing the PDF, right-click on the attachment, and select 'Save As' or 'Download' to save it to your local device.
Locate the saved PDF file on your computer, right-click it, select 'Open with', and choose your dedicated PDF editor.
Once the document is open in the PDF application, look for the 'Fill & Sign' or 'Edit' tab in the top menu to apply your signature.

Check Email Client PDF Integrations
Verify if your email client has disabled or restricted third-party add-ins for handling PDF files.
Use WPS Office to Easily Fill and Sign PDFs
WPS Office features a robust built-in PDF reader and editor that makes it incredibly simple to open email attachments, fill out forms, and add electronic signatures without any missing tools.
- 1. Save the PDF: Download the PDF attachment from your email client to a known folder on your device.
- 2. Open in WPS Office: Right-click the downloaded file and select 'Open with WPS Office'.
- 3. Select Fill & Sign: Navigate to the top menu bar and click on the 'Fill & Sign' tab.
- 4. Apply Signature: Click 'Sign', create your signature by typing, drawing, or uploading an image, and click on the document to place it.

Frequently Asked Questions
Why can't I edit a PDF directly in my email preview?
Most email clients, including Outlook and Gmail, use lightweight built-in previewers designed only for reading text. To access advanced features like editing or signing, the file must be opened in a specialized PDF application.
How do I change the default app for opening PDF attachments on Windows?
Go to your Windows Settings, select 'Apps', then 'Default apps'. Scroll down to 'Choose default apps by file type', locate '.pdf', and select your preferred PDF editor from the list.
Can I sign a PDF without paying for premium software?
Yes, many applications offer free electronic signature tools. WPS Office, for example, allows you to open PDFs, type text, and insert signatures at no cost.




