How to Resize the Compare Documents Pop-Up in Adobe Acrobat
Question details
The user is trying to find a way to enlarge the Compare Documents pop-up image in Adobe Acrobat because it is too small to read and disappears upon cursor hover.

- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Reviewing changes between two versions of a PDF document using the comparison tool.
- Observed behavior
- The comparison pop-up image is excessively small, disappears when the user moves the cursor over it, and lacks any visible rendering or sizing controls.
Ensure you are running the latest version of Adobe Acrobat, as application updates can occasionally alter how comparison panels and tooltips behave.
Understand Pop-up Limitations and Submit Feedback
Adobe Acrobat does not natively support resizing the comparison pop-up window, so utilizing Adobe's official feedback channel is the best recourse for a permanent feature change.
Currently, Adobe Acrobat does not provide a built-in toggle or setting to enlarge the comparison pop-up window manually. The dimensions of this pop-up scale automatically and dynamically depend on the amount of text or graphical content added to the specific PDF differences.
Because this is an inherent limitation of the Adobe interface rather than a fixable bug, the recommended approach is to formally request this feature directly from the Acrobat development team.
Open Adobe Acrobat, navigate to the 'Help' menu at the top of the screen, and select 'Provide Feedback', which will redirect you to the Adobe UserVoice platform.
Create a new post detailing your issue. Specify that the Compare Documents pop-up is too small to read, disappears on hover, and request an adjustable sizing option.

Use Manual Side-by-Side Window Comparison
Bypass the restrictive pop-up limitation entirely by detaching your PDF tabs to compare the two documents side-by-side manually.
Compare PDF Documents Easily with WPS Office
If Acrobat's small pop-ups and disappearing tooltips are slowing down your review process, WPS Office provides an intuitive, robust PDF reader. With its user-friendly interface, you can effortlessly view multiple PDFs in split-screen, zoom into details, and bypass document comparison frustrations.
- 1. Download the software: Visit the official WPS website, download the free version of WPS Office, and install it on your device.
- 2. Open the PDF files: Launch WPS PDF and click 'Open' to load the two PDF documents you wish to compare into separate tabs.
- 3. Enable side-by-side viewing: Navigate to the 'View' tab on the top ribbon and select the split-screen or side-by-side viewing options to stack your documents vertically or horizontally.
- 4. Review and markup: Use the full-screen readable layout to review changes easily, employing the 'Comment' tab to highlight or add notes to the discrepancies.

Frequently Asked Questions
Why does the Compare Documents pop-up disappear when I move my mouse over it?
In Adobe Acrobat, this particular comparison feature functions as a quick-preview hover tooltip rather than an interactive window. Because it is triggered purely by hovering over a specific icon or region, moving your cursor onto the tooltip itself interrupts the hover-state, causing the image to vanish automatically.
Is there any hidden registry setting to change the Acrobat pop-up size?
No, there are currently no registry edits, preference toggles, or hidden developer settings that allow users to override the hardcoded behavior or maximum dimensions of the document comparison pop-up in Acrobat.
Does Acrobat have a native side-by-side viewing shortcut?
Yes. If you prefer to manually compare documents, you can open both files, navigate to 'Window' > 'Tile' from the top menu, and select 'Vertically'. This will neatly snap your PDFs side-by-side within the application interface.




