File Sharing Problems

Excel File-Size Limits for OneDrive Co-Authoring Explained

Anum MushtaqAnum Mushtaq Oct 21, 2026 870 views

Question details

The user wants to know if there is a specific file-size limit for co-authoring an Excel workbook stored on OneDrive.

Excel File-Size Limits for OneDrive Co-Authoring Explained
Product
Microsoft Excel, OneDrive
Device & OS
not provided
Scenario
Sharing an Excel workbook via OneDrive or SharePoint for simultaneous team co-authoring.
Observed behavior
Users need clarification on size limitations to ensure smooth collaboration without performance drops or feature restrictions.
Before you start

Ensure your Excel workbook is saved in the .xlsx, .xlsm, or .xlsb format, as older formats like .xls do not support simultaneous co-authoring on OneDrive.

Solution 1Recommended

Understanding Limits and Enabling OneDrive Co-Authoring

While Microsoft does not enforce a separate file-size limit specifically for co-authoring, optimizing your file and setting correct permissions ensures the best collaboration experience.

Microsoft documentation does not specify a separate file-size limit exclusively for Excel co-authoring on OneDrive. However, general Excel workbook size, feature, and performance limits still apply to the cloud environment.

To co-author successfully, the file must be stored in a shared location such as OneDrive or SharePoint, and collaborators must be granted the appropriate editing permissions.

1
Save to a Cloud Location

Upload your Excel workbook to your OneDrive or SharePoint document library. Co-authoring is only supported for files stored in these Microsoft cloud services.

2
Share the Workbook

Open the workbook in Excel, click the 'Share' button in the top right corner of the application window, and enter the email addresses of your collaborators.

3
Grant Editing Permissions

Before sending the invitation, click the permission dropdown and select 'Can edit'. This ensures your team can make changes simultaneously.

4
Optimize Large Workbooks

If your workbook is exceptionally large or slow, consider clearing excess formatting from empty cells, compressing images, or saving the file in the Excel Binary Workbook format (.xlsb) to improve sync speed.

Understanding Limits and Enabling OneDrive Co-Authoring
Performance Consideration: Extremely large files with complex calculations or heavy macros may experience syncing delays or performance drops during simultaneous co-authoring.
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Frequently Asked Questions

What happens if my Excel file on OneDrive is too large?

If your Excel file is excessively large, you may experience slower sync times, lagging during co-authoring, or occasional timeout errors. It is highly recommended to optimize the file by removing unused formatting, deleting unnecessary sheets, and compressing embedded media.

Which Excel file formats support co-authoring?

Co-authoring on OneDrive and SharePoint is fully supported for .xlsx, .xlsm, and .xlsb file formats. Older formats like .xls or Strict Open XML formats do not support simultaneous editing and will lock the file for one user at a time.

Why can't my team edit the shared OneDrive Excel file simultaneously?

This issue typically occurs if the file isn't explicitly shared with 'Edit' permissions, someone is using an outdated desktop version of Excel that lacks co-authoring support, or the workbook contains unsupported features (such as certain data validation rules or legacy shared workbook settings).