On the File menu, click Info. Click on Protect Workbook and select the Always Open Read-Only. See also Prompt to open a workbook as read-only

If you don't want content reviewers to accidentally change a Word document or an Excel spreadsheet, you can use formatting and editing restrictions. Note: To further restrict reviewers …

If you want to remind everyone that a workbook should only be changed if necessary, you can recommend that the workbook be opened as read-only. Note: Prompting to open as read-only …

If your file opened in Microsoft Office as "Read-only", and you're not sure why, this article can help you remedy that situation.

If you don't want content reviewers to accidentally modify your document, you can make the document read only before sending it for review. Another method is to restrict formatting and …

When you try to open a Excel workbook, PowerPoint presentation, or Word document on your mobile device, you might receive a message stating that the file is locked for editing by …

Find out how you can unlock an Excel spreadsheet when you are locked out of an Excel file by yourself or by another user.

Excel gives you the ability to protect your work, whether it’s to prevent someone from opening a workbook without a password, granting Read-Only access to a workbook, or even just …

To set the workbook as read-only, select Anyone with the link can edit, clear the Allow editing check box, and then select Apply. (You'll see that that option now reads Anyone with the link …

To protect a file tap the edit button in your app, go to the Review tab and tap the Restrict Permissions button. You'll see a list of available IRM policies; select the one you want and tap …