Office Compatibility Issues

How to Fix OneNote Displaying Squares Instead of Letters or Text

WPS Content Manager Oct 9, 2026 871 views

Question details

The user's OneNote application is replacing standard text characters with square box symbols across the interface, page titles, notebook names, and links.

How to Fix OneNote Displaying Squares Instead of Letters or Text

Product: Microsoft OneNote
Device & OS: Windows
Scenario: Reading or navigating notebooks in the OneNote desktop, web, or Microsoft Teams applications.
Observed behavior: Text characters fail to render correctly and are instead displayed as square blocks, indicating severe font or component corruption.

Before you start

Before making system changes, verify if the issue is limited to OneNote or affecting other applications on your device, and ensure your notebooks are fully synced to OneDrive.

Solution 1Recommended

Clear OneNote Cache and Repair Office Installation

Corrupted application cache files or damaged Office program files are common culprits for font rendering issues.

Clearing the local cache forces OneNote to rebuild its temporary data, which often resolves display glitches. Following up with an Office repair ensures that all underlying shared font components are intact.

Close all Office applications

Ensure that OneNote, Word, Excel, and other Microsoft Office programs are completely closed on your computer.

Clear the OneNote cache

Press the Windows key + R to open the Run dialog. Type '%localappdata%\Microsoft\OneNote' and press Enter. Open the folder matching your version (e.g., '16.0') and delete the folder named 'cache'.

Run an Office Online Repair

Open the Windows Control Panel and navigate to 'Programs and Features'. Find Microsoft Office in the list, right-click it, select 'Change', and choose 'Online Repair'. Follow the prompts to complete the repair.

Clear OneNote Cache and Repair Office Installation

Sync Warning: Deleting the OneNote cache may remove un-synced offline edits. Always verify your notes are visible on OneNote for Web before proceeding.

Solution 2

Test with a New Local Administrator Account

Creating a new user profile helps determine if the font rendering issue is tied to your current Windows user profile corruption.

Solution 3

Reinstall Microsoft Office and Windows

If caching and profile fixes fail, severe system font or component corruption may require a clean software reinstallation.

Free Microsoft Office alternative

Switch to WPS Office for a Reliable Document Experience

If Microsoft Office applications frequently encounter corrupted components or frustrating display issues, consider switching to WPS Office. It provides a lightweight, highly compatible, and free alternative to Word, Excel, and PowerPoint without the heavy system footprint that leads to constant errors.

1. Download the Installer: Visit the official WPS Office website and download the free software package for Windows, Mac, or Linux.
2. Install WPS Office: Run the setup file and follow the straightforward on-screen instructions to quickly install the application.
3. Open Office Files: Launch WPS Office and directly open your existing Microsoft Office documents without any formatting loss or display glitches.

Fully compatible with Microsoft Office formats, including .docx, .xlsx, and .pptxLightweight installation that minimizes the risk of system component and font corruptionFamiliar, tabbed user interface allowing you to navigate seamlesslyFree to use with powerful built-in PDF editing tools

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Frequently Asked Questions

Why is my computer showing squares instead of font characters?

This happens when the operating system or application cannot locate the correct font file, or the font cache has become corrupted. The system defaults to displaying a 'missing character' symbol, which looks like a square or a rectangle.

Will deleting the OneNote cache delete my notes?

Deleting the local cache will not delete notes that have been successfully synced to OneDrive. However, any offline edits that haven't synced yet will be lost, so it is highly recommended to check OneNote for Web before clearing the cache.

Can a corrupted Windows profile cause font issues in Office?

Yes. A damaged Windows user profile can restrict an application's read-and-write permissions to the system's temporary directories or font library, leading to display errors like text appearing as squares.

Does reinstalling Office fix OneNote sync errors as well?

A clean installation of Office resolves underlying software corruption, which can fix both display bugs and persistent syncing problems. Make sure to back up local notebooks before uninstalling.

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