Fix Acrobat or Reader Freezing When Commenting on PDFs
Question details
Users experience application crashes and freezing when attempting to add comments or annotations to PDF files using Adobe Acrobat or Reader.

- Product
- Adobe Acrobat / Adobe Reader
- Device & OS
- not provided
- Scenario
- Adding comments, highlights, or text notes to a PDF document.
- Observed behavior
- The application suddenly freezes, becomes unresponsive, and closes without saving the comments.
Before troubleshooting the application, ensure you have saved a backup copy of your PDF file to prevent any data loss during an unexpected crash.
Update Adobe Acrobat or Reader to the Latest Version
Installing the latest software update patches known bugs and is the most common fix for freezing or crashing issues during PDF annotation.
Software developers frequently release patches to address stability issues. An outdated version of Acrobat or Reader may contain a bug that triggers a freeze when the commenting tool is activated.
Open Adobe Acrobat or Adobe Reader on your computer.
Click on the 'Help' tab located in the top menu bar of the application window.
Select 'Check for Updates' from the dropdown menu and follow the on-screen prompts to download and install any available patches.
Once the update is complete, restart the application. Open your PDF and try adding a comment to verify the issue is resolved.

Test for Document-Specific Corruption
Determine whether the freezing issue is caused by the application itself or by a corrupted element within the specific PDF file.
Reset Application Preferences
Corrupted preference files can cause unexpected behavior. Resetting them restores the application to its default configuration.
Use WPS PDF for Stable and Smooth Commenting
If your current PDF reader continues to freeze and disrupt your workflow, consider switching to WPS Office. It includes a highly stable, lightweight, and completely free PDF reader and editor that allows you to add comments, annotate, and manage PDFs without performance issues.
- 1. Download and Install WPS Office: Get the free WPS Office suite from the official website and install it on your PC or Mac.
- 2. Open Your PDF: Launch WPS PDF and open the document you wish to review.
- 3. Annotate Smoothly: Navigate to the 'Comment' tab to instantly add highlights, shapes, and sticky notes without software lag.

Frequently Asked Questions
Why does my PDF software crash only when I click the comment tool?
This specific trigger usually occurs due to an outdated software version, corrupted application preference files, or conflicts with specific fonts that the comment tool is trying to load from your operating system.
Can a corrupted PDF file cause the entire application to freeze?
Yes. If a PDF contains malformed code, broken interactive elements, or corrupted graphical layers, attempting to modify it by adding a comment can overwhelm the software's rendering engine and force the application to freeze.
Will I lose my PDF comments if the application unexpectedly closes?
Generally, yes. Any unsaved changes, including newly added comments or annotations, are lost when the application crashes. It is highly recommended to save your work frequently using the Ctrl+S (or Cmd+S on Mac) shortcut while editing.




