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PDF Editing Issues

Fix Fill & Sign Option Missing When Opening a PDF from Email

Olivia MillerOlivia Miller Oct 23, 2026 869 views

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.

How to Fix the Fill & Sign Option Missing When Opening a PDF from 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.
Before you start

Ensure you have a dedicated PDF editing application installed on your device, as built-in email previewers typically lack advanced editing and signature tools.

Solution 1Recommended

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.

1
Download the attachment

Open the email containing the PDF, right-click on the attachment, and select 'Save As' or 'Download' to save it to your local device.

2
Open with a PDF editor

Locate the saved PDF file on your computer, right-click it, select 'Open with', and choose your dedicated PDF editor.

3
Access Fill & Sign

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.

Save and Open the PDF in a Dedicated PDF Editor
Default App Settings: Setting your preferred PDF software as the default application for .pdf files will save you time in the future.
Comprehensive PDF Editor

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. 1. Save the PDF: Download the PDF attachment from your email client to a known folder on your device.
  2. 2. Open in WPS Office: Right-click the downloaded file and select 'Open with WPS Office'.
  3. 3. Select Fill & Sign: Navigate to the top menu bar and click on the 'Fill & Sign' tab.
  4. 4. Apply Signature: Click 'Sign', create your signature by typing, drawing, or uploading an image, and click on the document to place it.
Easily add, manage, and insert electronic signatures into any PDF document.Fully compatible with standard PDF formats and Adobe Acrobat files.Lightweight architecture ensures large PDF email attachments open quickly.Includes comprehensive tools for editing, annotating, and converting PDFs.
microsoft office alternative - wps office

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.