Fix: Viber Makes Microsoft Office Documents Unreadable on iOS 18
Question details
Users are experiencing an issue where Microsoft Office documents become completely unreadable after being transferred through the Viber app.
- Product
- Microsoft Office / Viber
- Device & OS
- iOS 18
- Scenario
- Sending, receiving, or opening document files using the Viber messaging application.
- Observed behavior
- Documents are being transformed or corrupted by Viber during transmission, rendering them unreadable when the recipient attempts to open them on an Apple device.
Ensure that your Microsoft Office apps and the Viber application are both updated to their latest versions from the App Store, as developers frequently release patches for iOS 18 compatibility.
Contact Viber Support for Transmission Bugs
Because the file corruption occurs during transfer via a third-party application, reaching out to Viber Support is the most direct way to get the bug documented and resolved.
Viber handles file compression and transmission internally. When a major operating system update like iOS 18 is released, third-party messaging apps sometimes experience unexpected behaviors with specific file types until a patch is issued.
Launch the Viber app on your iOS 18 device, tap on the 'More' tab at the bottom of the screen, and select 'Settings'.
Tap on 'Help & Support' from the settings menu.
Follow the prompts to contact support, specifically mentioning that Microsoft Office documents are being altered and made unreadable during transmission on iOS 18.
Use Alternative File Sharing Methods
Bypass the Viber app's file transfer protocol entirely by using native Apple sharing features or email to send the documents safely.
Try WPS Office for Seamless Document Viewing on iOS
If your Microsoft Office documents are experiencing readability issues on your iPhone, WPS Office offers a highly compatible, lightweight, and stable alternative for reading, editing, and sharing files directly from your mobile device.
- 1. Download the App: Search for WPS Office in the Apple App Store and download it to your iOS device.
- 2. Import Your Documents: Open WPS Office and browse your local files to open the desired document directly.
- 3. Share Securely: Use WPS Office's built-in sharing features to generate secure links rather than sending raw files through third-party messengers.

Frequently Asked Questions
Why does Viber change my Microsoft Office document format on iOS 18?
Viber compresses and processes files to save bandwidth during transmission. On newer operating systems like iOS 18, this processing might unintentionally alter the internal structure or extensions of Office documents, leading to file corruption.
Can I recover a document that was already made unreadable by Viber?
If the file was structurally modified during transfer, it might not be recoverable on the recipient's end. The best solution is to ask the sender to resend the original file via an alternative method like email or a cloud storage link.
Does this unreadable document issue affect all messaging apps on iOS 18?
No, this specific formatting issue is currently isolated to how the Viber application processes file attachments on iOS 18. Other applications like iMessage, Telegram, or WhatsApp may still transmit Office documents correctly.
How can I prevent document corruption when sharing from my iPhone?
To safeguard your files, zip the document into an archive before sending it, or upload the document to a cloud drive (like iCloud, Google Drive, or WPS Cloud) and share the direct link via Viber instead of attaching the raw file.




