How to Fix Acrobat Crashing When Setting PDF Encryption Passwords
Question details
The user needs to apply a document-open password to encrypt a PDF but experiences application crashes.

- Product
- Adobe Acrobat DC
- Device & OS
- Windows 10 Pro 64-bit
- Scenario
- Trying to protect a PDF document with a password using the Protect tool accessed from the main Tools menu.
- Observed behavior
- The Adobe Acrobat DC application crashes consistently every time the user attempts to set a document-open password from the Tools menu.
Ensure your Adobe Acrobat DC is updated to the latest version, as software patches often resolve unexpected crashes. Additionally, check that your PDF file is not already restricted or corrupted by trying to open it in another basic viewer.
Use the Right-Side Protect Pane Workaround
Bypass the main Tools menu and use the right-hand panel option to apply PDF encryption without triggering the software crash.
In certain versions of Acrobat DC, a UI glitch causes the application to crash when the Protect tool is launched directly from the top Tools menu. Initiating the same function from the right-side toolbar often avoids this bug entirely.
Launch Adobe Acrobat DC and open the PDF file you wish to encrypt.
Instead of clicking the 'Tools' tab at the top left of the window, look at the vertical toolbar on the right side of your screen.
Click on the 'Protect' shield icon located in the right-side pane.
In the new bar that appears at the top, click 'Encrypt' and select 'Encrypt with Password'. Enter your document-open password, confirm it, and save the file.

Repair Adobe Acrobat Installation
Fix potentially corrupted program files that might be causing the software to crash during the encryption process.
Password Protect PDFs Easily with WPS Office
If Adobe Acrobat continues to crash and disrupt your workflow, use WPS Office to quickly and securely encrypt your PDF files. WPS Office provides a stable, built-in PDF editor that handles document-open passwords and permissions without performance issues.
- 1. Open your PDF: Launch WPS Office and open the PDF file you want to password-protect.
- 2. Go to the Protect tab: Navigate to the 'Protect' tab located on the top ribbon of the PDF interface.
- 3. Open encryption settings: Click on the 'Encrypt' button to bring up the password security dialog box.
- 4. Set your password: Check the box for 'Set Open Password', type in your secure password, and click 'Confirm'.
- 5. Save the file: Press Ctrl + S or go to Menu > Save to apply and finalize the encryption.

Frequently Asked Questions
Why does Adobe Acrobat crash only when using the Tools menu?
Software bugs or corrupted UI components in specific versions of Acrobat DC can cause crashes when triggering tools from certain menus. Using alternative entry points, like the right-side pane, often bypasses the corrupted trigger.
Does repairing Adobe Acrobat always fix the crashing issue?
Not always. While repairing the installation fixes missing or corrupted core files, it may not resolve version-specific bugs. If the repair fails, using a UI workaround or an alternative PDF editor like WPS Office is highly recommended.
Are PDFs encrypted in WPS Office compatible with Adobe Acrobat?
Yes, WPS Office uses standard PDF encryption protocols. A PDF password-protected in WPS Office can be opened and viewed in Adobe Acrobat or any other standard PDF reader, provided the user enters the correct password.
What is the difference between a document-open password and a permissions password?
A document-open password prevents users from opening and viewing the PDF entirely without the password. A permissions password allows anyone to open the file but restricts specific actions like editing, printing, or copying text.




