PDF Editing Issues

How to Fix Glitchy Apple Pencil Annotations in PDF on iPad

Nimra Malik Oct 18, 2026 868 views

Question details

The user needs to resolve an issue where handwritten annotations made with an Apple Pencil appear pixelated or glitchy after saving a PDF file.

How to Fix Glitchy Apple Pencil Annotations in PDF on iPad

Product: Acrobat Reader Mobile
Device & OS: iPadOS
Scenario: Writing, drawing, or highlighting on a PDF document using an Apple Pencil.
Observed behavior: Apple Pencil handwriting drops in quality, becoming glitchy or pixelated after the user saves the document or switches to another tool within the app.

Before you start

Ensure your Apple Pencil is fully charged, correctly paired with your iPad, and that the pencil tip is securely tightened before proceeding with software troubleshooting.

Solution 1Recommended

Update the PDF Application to the Latest Version

Since this is a known rendering bug acknowledged by the application's development team, installing the latest patch is the primary way to permanently resolve the issue.

Software updates often contain critical bug fixes for rendering engines. If your annotations are glitching after a save, the developers have likely released a patch to address how the app handles vector graphics from the Apple Pencil.

Open the App Store

Navigate to the home screen of your iPad and tap the App Store icon.

Search for the app

Tap the search icon at the bottom right, type 'Acrobat Reader' (or your respective PDF app), and locate it in the search results.

Install updates

If an 'Update' button is visible next to the app, tap it to download and install the latest version containing the bug fix.

Update the PDF Application to the Latest Version

Patience Required: If no update is currently available, the development team may still be working on the fix. You can enable automatic app updates in your iPad settings to ensure you receive the patch as soon as it goes live.

Solution 2

Force Restart the Application and iPad

Clearing the device's temporary memory can occasionally resolve temporary graphic rendering glitches associated with the Apple Pencil.

Annotate PDFs smoothly with WPS Office

Use WPS Office for Flawless Apple Pencil Annotations

If your current PDF reader continues to glitch, switch to WPS Office. Its built-in PDF editor provides seamless, lag-free Apple Pencil integration on iPad, allowing you to handwrite, highlight, and sign documents with perfect clarity.

1. Download WPS Office: Install WPS Office for free from the Apple App Store on your iPad.
2. Open your PDF file: Launch WPS Office, tap 'Open', and select the PDF document you want to edit.
3. Access annotation tools: Tap on the 'Tools' menu at the bottom, then select 'Annotation' or 'Draw'.
4. Start writing: Use your Apple Pencil to write naturally on the document. The strokes will remain crisp and clear even after saving.

Smooth, high-quality Apple Pencil stroke rendering without post-save glitchesFully compatible with Microsoft Office formats (Word, Excel, PowerPoint) and standard PDFsLightweight application with intuitive palm rejection technologyFree to use with comprehensive annotation and reading tools

microsoft office alternative - wps office

Frequently Asked Questions

Why do my Apple Pencil annotations become blurry or pixelated after I save the PDF?

This happens when a PDF reader improperly converts smooth vector strokes (captured by the Apple Pencil) into lower-resolution raster images during the saving process to reduce file size. It is usually a software bug that requires an app update to fix.

Can a worn-out Apple Pencil tip cause glitchy handwriting in PDFs?

While a worn tip can cause skipping or unresponsive strokes, it generally does not cause strokes to look perfectly fine while writing but become glitchy only after saving. Post-save quality drops are almost always software-related.

How can I back up my annotations before switching features to prevent quality loss?

Before switching tools, you can use the 'Save As' or 'Export' feature to create a flattened copy of your PDF. Alternatively, taking a quick screenshot of important handwritten notes ensures you have a high-quality record in case the app glitches.