Office Performance Issues

How to Free Up Excessive Storage Used by the Microsoft Office Mobile App

Maira Mehtab Oct 1, 2026 870 views

Question details

The user needs to free up storage space consumed by the Microsoft Office mobile app, which is using significantly more storage than its base installation size.

Product: Microsoft Office Mobile App
Device & OS: not provided
Scenario: The user is running out of storage space on their mobile device and notices the Office app is a major contributor, despite not having many large local documents.
Observed behavior: The app's storage usage balloons far beyond its installed size due to hidden cached files, offline content, document previews, and synchronized application data.

Before you start

Before clearing application data or reinstalling the app, verify that all your recent documents are fully synchronized with OneDrive or another cloud storage service to prevent accidental data loss.

Solution 1Recommended

Clear App Cache and Data via Device Settings

Use your phone's built-in system settings to wipe the bloated cache and temporary data generated by the Office app.

Mobile operating systems allow you to manually clear an app's cache and data. Clearing the cache removes temporary files, while clearing data resets the app to its default state.

Open Device Settings

Navigate to your mobile device's main 'Settings' application and select 'Apps', 'App Management', or 'Apps & Notifications' depending on your operating system.

Locate Microsoft Office

Scroll through the list of installed applications and tap on 'Office' or 'Microsoft Office'.

Access Storage Options

Tap on 'Storage' or 'Storage usage' to view the breakdown of the space consumed by the application.

Clear Cache and Data

Tap 'Clear Cache' first to see if that frees up enough space. If the storage usage is still too high, tap 'Clear Data' or 'Clear Storage'.

Clear App Cache and Data via Device Settings

Account Sign-out Warning: Clearing all app data will sign you out of your Microsoft account and remove local preferences. It will not delete files that are already safely synced to OneDrive.

Solution 2

Offload or Reinstall the Office App

If clearing the cache is insufficient or the option is unavailable, completely offloading or reinstalling the app offers a clean slate.

Solution 3

Remove Offline Files Within the App

Manually delete documents that have been pinned or downloaded for offline use directly inside the Office app interface.

Free Microsoft Office alternative

Save Mobile Storage with the Lightweight WPS Office App

If Microsoft Office continues to drain your phone's storage with excessive cached data, consider switching to WPS Office. It provides a highly optimized, all-in-one mobile solution that takes up significantly less space while letting you read, edit, and create documents effortlessly.

1. Download the App: Visit the App Store or Google Play Store, search for WPS Office, and tap install.
2. Sign In for Cloud Access: Log in with your email or social account to enable seamless cloud syncing across your devices.
3. Open Your Documents: Tap the folder icon to browse and open existing Microsoft Office documents saved locally or in the cloud.

Optimized app architecture uses less base storage and minimizes cache bloat on mobile devices.Fully compatible with Microsoft Word, Excel, PowerPoint, and PDF file formats.Combines Writer, Spreadsheet, Presentation, and PDF tools into a single lightweight application.Built-in cloud integration ensures your files are safely backed up without taking up local space.

microsoft office alternative - wps office

Frequently Asked Questions

Why does the Microsoft Office mobile app take up so much storage?

The app stores cached files, document previews, offline content, and synchronized application data to speed up loading times. Over time, these temporary files accumulate and can take up significantly more space than the initial app download.

Will clearing app data delete my Microsoft account or documents?

No. Clearing app data will log you out of the app and reset your local preferences, but it does not delete your Microsoft account. Any documents that have been successfully synchronized to OneDrive or other cloud services remain safe and accessible.

How do I prevent the Office app from downloading files locally?

You can manage this by ensuring you do not mark files for 'Offline Use' within the app. Additionally, make a habit of saving new documents directly to your connected cloud storage rather than selecting the local 'On My Device' folder.

Office App Problems