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How to Recover an Excel File Corrupted by the iOS Office App
Question details
Users need a reliable way to recover Excel files that have become corrupted and unreadable after being edited and saved in iCloud via the Microsoft 365 app on Apple devices.
- Product
- Microsoft Excel (iOS), Microsoft 365 App
- Device & OS
- iOS / iPadOS
- Scenario
- Editing an iCloud-stored Excel workbook on an iPhone or iPad using the Microsoft Office app.
- Observed behavior
- After changing a cell and exiting the Microsoft 365 app, the Excel file size drastically drops (e.g., to ~66 KB) and the file becomes unreadable or corrupted.
Ensure you have access to a Mac, iPhone, or iPad with the Apple Numbers app installed, as you will need it to browse the iCloud version history of your corrupted file.
Recover the File Using Apple Numbers and iCloud Version History
This method utilizes Apple's native Numbers app to access previously cached, uncorrupted versions of your iCloud file and export it back to a working Excel format.
Because the corruption happens within the Microsoft 365 app's interaction with iCloud, the native Office app cannot usually fix the file. Instead, Apple Numbers can bypass the corruption by rolling the file back to a previous save state.
Launch the Apple Numbers app on your iOS device or Mac. Navigate to your iCloud Drive folder and select the corrupted Excel file to open it.
Once opened, access the file options. On a Mac, go to File > Revert To > Browse All Versions. On an iPhone or iPad, tap the file name at the top and select 'Browse All Versions' or 'Revert'. Choose a cached version from before the editing corruption occurred.
After restoring the older version, go to File > Export To > Excel (or tap Share > Export and Send > Excel on iOS). Save this file with a slightly different name to prevent overwriting.
Check the newly exported file to ensure it ends with the .xlsx extension. If it doesn't, manually rename the file to include the .xlsx extension, then attempt to open it in a desktop version of Excel.
Edit Excel Files on iOS Safely with WPS Office
Avoid iCloud file corruption bugs caused by the Microsoft 365 iOS app. WPS Office is a highly compatible, lightweight alternative that lets you securely view, edit, and save Excel files directly on your iPhone or iPad.
- 1. Download WPS Office: Search for WPS Office in the Apple App Store and install it on your iPhone or iPad.
- 2. Open Your Spreadsheets: Launch WPS Office, browse to your iCloud or local storage, and open your .xlsx files.
- 3. Edit Safely: Make your necessary changes and save securely without risking the iOS Office app corruption loop.
Frequently Asked Questions
Why do my Excel files corrupt when I edit them on my iPhone?
There is a known workflow issue between the Microsoft 365 iOS app and Apple's iCloud. Opening a file is usually fine, but editing a cell and leaving the app can cause the file to drastically reduce in size and become corrupted.
Can I recover the file using the Microsoft Office app itself?
Generally, no. Because the Microsoft app overrides the current save state with corrupted data upon exit, you must use Apple Numbers or iCloud.com's version history to restore a previously cached version.
Are files stored on OneDrive affected by this iOS bug?
Based on user reports, this specific corruption issue primarily affects Excel files stored in Apple's iCloud. Files edited in OneDrive or outside the iCloud workflow are typically unaffected by this bug.
How can I prevent iCloud Excel corruption in the future?
To prevent data loss, avoid editing iCloud-stored Excel files directly in the iOS Office app. You can move the files to local iPhone/iPad storage before editing, edit them on a desktop, or use a reliable alternative app like WPS Office for your mobile edits.
