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How to Fix Pen Writing Turning into Lines on a PDF

Ayan Masood Oct 9, 2026 870 views

Question details

Users experience an issue where pen taps or handwritten notes automatically convert into straight lines when annotating a PDF document.

How to Fix Pen Writing Turning into Lines on a PDF

Product: Microsoft 365 / PDF Editors
Device & OS: iOS / Android
Scenario: Writing notes, annotating slides, or drawing on a PDF using a stylus such as the Lenovo Precision Pen 2 or Apple Pencil.
Observed behavior: Small pen marks and letters disappear or are unexpectedly converted into straight lines, preventing accurate handwriting.

Before you start

Verify that your stylus is fully charged and test it in a different drawing application to determine if the issue is hardware-related or specific to your PDF editor.

Solution 1Recommended

Disable Handwriting and Shape Correction Features

Turn off auto-correction or shape recognition features that might misinterpret your pen strokes as straight lines.

Many modern tablets and stylus pens include features that automatically straighten lines or convert rough drawings into perfect shapes. While useful for drafting, these can ruin natural handwriting on PDFs.

Open Application Settings

Launch your PDF editor or Microsoft 365 app and navigate to the settings menu.

Locate Pen Settings

Look for preferences related to the stylus, pen, or drawing tools.

Disable Auto-Correction

Turn off any features labeled 'Shape Recognition', 'Line Correction', or 'Draw and Hold' (common on iOS devices).

Test Handwriting

Return to your document and try writing small letters or tapping dots to see if the issue is resolved.

Disable Handwriting and Shape Correction Features

Solution 2

Update the App and Try Alternate Tools

Software bugs following recent updates can interfere with stylus input. Updating your application and using the correct in-app tools can help.

Seamless PDF Annotation

Annotate PDFs Naturally with WPS Office

If you are struggling with handwriting glitches in other apps, WPS Office provides a highly optimized PDF editing experience. It accurately captures stylus strokes, handwriting, and annotations without unwanted line corrections.

1. Download WPS Office: Install WPS Office for free from the official website or your device's app store.
2. Open Your PDF: Launch the application and open the PDF document you want to annotate.
3. Select the Pen Tool: Navigate to the 'Comment' or 'Edit' tab and choose the Pen tool for freehand drawing.
4. Annotate Naturally: Write notes and draw freely on your document; your handwriting will be captured accurately.

Accurate stylus and pen tracking for natural handwritingFully compatible with Microsoft Office files and standard PDF formatsLightweight application with comprehensive PDF reading and editing toolsFree to use across iOS, Android, Windows, and Mac platforms

microsoft office alternative - wps office

Frequently Asked Questions

Why does my iPad turn my handwriting into straight lines?

This is typically caused by the iOS 'Draw and Hold' or shape recognition feature. If you hold your pen at the end of a stroke, the operating system automatically snaps rough shapes or lines into perfect geometric forms.

Can the Lenovo Precision Pen 2 cause line glitches in Microsoft 365?

Yes, some users experience an issue where small marks or letters disappear or turn into lines when using the Lenovo Precision Pen 2 in Microsoft 365. This is often due to conflicting handwriting or line-correction settings.

Is Adobe Acrobat Reader included with Microsoft Office?

No, Adobe Acrobat Reader is a separate, third-party application and is not part of the Microsoft Office suite. If you are experiencing issues with Office's built-in PDF tools, using a dedicated PDF editor may provide better results.

How do I draw a simple dot instead of a line in PowerPoint for iOS?

To draw a dot, select the Draw tool and lightly tap the screen once. Avoid dragging the stylus, as dragging is the gesture used to initiate a continuous line.

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