PDF Editing Issues

Fix iPad Pen Drawings Distorted in Acrobat Reader Mobile

Algirdas Jasaitis Oct 19, 2026 868 views

Question details

User needs a solution for stylus drawings on PDF files that appear normal during the editing process but distort once changes are saved.

How to Fix iPad Pen Drawings Becoming Distorted in Acrobat Reader Mobile

Product: Acrobat Reader Mobile
Device & OS: iPadOS
Scenario: Annotating or drawing on a PDF document using a stylus (such as a Baseus pen) on an iPad.
Observed behavior: The pen strokes and drawings look correct while actively editing, but immediately become distorted or shift out of place after selecting 'Done' in the app.

Before you start

Ensure that your iPadOS is fully updated and check the App Store for any pending updates for Acrobat Reader Mobile, as rendering glitches are frequently patched by developers.

Solution 1Recommended

Verify App Version and Provide Sample Data

Since distortion on saving is often tied to specific application builds, identifying your version and isolating the file helps determine if it's a known rendering bug.

Software rendering engines handle active drawing and saved static views differently. If the coordinates recalculate incorrectly upon tapping 'Done', it usually points to a version-specific bug in the mobile PDF reader.

Check the Acrobat App Version

Open Acrobat Reader Mobile, tap your profile icon, and navigate to 'Settings' or 'About' to note down the specific application version you are currently using.

Check the iPadOS Version

Go to your iPad's main 'Settings' app, tap 'General', and select 'About' to find your current iOS/iPadOS version.

Test Different Drawing Tools

Open a blank PDF and test whether the distortion occurs every time you use the pen tool, or if it also affects highlighters and text boxes.

Report to Support

Provide these version details along with a sample PDF containing the affected markup to the official support channel for further investigation.

Information: Creating a screen recording of the screen while you draw and tap 'Done' can be extremely helpful for support teams attempting to replicate the bug.

Solution 2

Reinstall the Application to Clear Rendering Cache

A clean installation can resolve underlying cache issues or corrupted app files that might be causing the visual distortion after saving.

Annotate PDFs Smoothly with WPS Office on iPad

If your current PDF reader continues to distort your drawings upon saving, switch to WPS Office for iOS. It provides a highly stable PDF editing environment with seamless stylus support, ensuring your annotations and pen strokes look exactly as you drew them.

1. Install WPS Office: Download WPS Office Free from the iPad App Store and launch the application.
2. Open Your PDF: Tap on the 'Files' tab within WPS Office and select the PDF document you want to annotate.
3. Access the Pen Tool: Tap on the 'Edit' or 'Annotation' menu at the top, select the Pen tool, and customize your ink color and thickness.
4. Draw and Save: Use your stylus to write or draw on the document. Tap 'Done' or the save icon; your strokes will remain perfectly rendered without distortion.

Accurate stylus support with no post-save distortion or shifting.Fully compatible with all standard Microsoft Office and standard PDF formats.Rich set of free annotation tools including pens, highlighters, and shapes.Lightweight app optimized for smooth performance on all iPad models.

microsoft office alternative - wps office

Frequently Asked Questions

Why do my pen strokes shift or distort when I tap 'Done' in a PDF editor?

This usually occurs because the application uses a different rendering engine for the active editing mode compared to the static view mode. Software bugs can cause the vector coordinates of your pen strokes to recalculate or scale incorrectly when transitioning between these two modes.

Does using a third-party stylus cause PDF drawing distortion?

While third-party styluses (like a Baseus pen) might lack advanced features like pressure sensitivity or tilt recognition compared to the Apple Pencil, standard digital ink strokes should still render correctly. Distortion that only happens after saving is almost entirely a software rendering issue, not a hardware fault.

How can I recover the original PDF if the drawings corrupted the file?

If your original file was saved in a cloud service (like iCloud, Google Drive, or Adobe Cloud), you can often access the 'Version History' from a desktop browser to restore a previous, uncorrupted version of the document.

Are there alternative iPad apps that won't distort my PDF drawings?

Yes, if you are experiencing persistent rendering bugs in one application, you can use alternative PDF editors like WPS Office, which offer robust stylus compatibility and stable saving mechanisms to ensure your annotations remain accurate.

PDF Troubleshooting