File Cannot Open

How to Fix Word Documents in Box That Cannot Be Previewed or Edited

Maira Mehtab Oct 13, 2026 869 views

Question details

Users are unable to preview or edit Microsoft Word documents stored on the Box platform, despite the files functioning correctly in the past.

How to Fix Word Documents in Box That Cannot Be Previewed or Edited

Product: Box / Microsoft Word
Device & OS: not provided
Scenario: Attempting to view or modify a Word document directly within the Box web interface.
Observed behavior: The document displays preview conversion errors or outright refuses to open for online editing.

Before you start

Ensure you have a stable internet connection and verify on the Box status page that there are no ongoing service outages affecting document conversion.

Solution 1Recommended

Verify Box File Permissions and Status

Check if your account has the necessary access rights or if the document is locked by another user.

Box relies on specific permission levels to allow editing. If your access level was changed to 'Viewer' or if someone else is currently modifying the file, Box will restrict your ability to edit or properly preview the document.

Log into Box

Check Permissions

Click the 'Share' or 'Collaborators' pane on the right side to ensure your account is listed with 'Editor' permissions.

Check File Lock Status

Right-click the document and look for a lock icon or select 'Properties'. If it is locked, wait for the other user to finish or request them to unlock it.

Solution 2

Clear Browser Cache and Switch Browsers

Corrupted browser data can interfere with the Box web viewer and its document rendering scripts.

Solution 3

Contact Box Support

If local troubleshooting fails, the issue may be related to Box's internal document conversion servers.

Seamless Local Editing

Download and Edit Your Documents with WPS Office

If Box's online preview and editing features are currently unavailable, you can bypass the error by downloading your document and easily editing it locally with WPS Office.

1. Download from Box: Select the problematic Word document in the Box web interface, click the ellipsis (...) menu, and choose 'Download'.
2. Open WPS Office: Launch WPS Office on your computer and click 'Open' from the main dashboard.
3. Edit Locally: Locate the downloaded document in your local Downloads folder and open it to begin editing instantly.
4. Save and Re-upload: Once your edits are complete, save the file locally and drag it back into your Box folder to update the cloud version.

Fully compatible with Microsoft Word (.docx) formatsLightweight application that opens large documents instantlyRich set of built-in editing, formatting, and review toolsFunctions completely offline without relying on cloud servers

microsoft office alternative - wps office

Frequently Asked Questions

Why does Box say my Word document cannot be previewed?

Box may encounter preview conversion errors if the document is excessively large, password-protected, or contains highly complex formatting and embedded macros that the web viewer cannot process.

Can I edit a Box document if it is marked as read-only?

No. If a document is marked as read-only or locked, you must either contact the file owner to grant you 'Editor' permissions or wait for the user currently editing it to unlock the file.

Does clearing cookies log me out of Box?

Yes, clearing your browser's cookies will log you out of your current Box session. You will need your username and password to log back in after clearing the data.

Does WPS Office fully support files downloaded from Box?

Yes, WPS Office is fully compatible with standard Microsoft Office formats. You can seamlessly open, edit, and save downloaded .docx files without losing your formatting.

Document & File Issues