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

You can check the file properties by right-clicking on the file and choosing Properties. If the Read-only attribute is checked, you can uncheck it and click OK.

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 …

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 …

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 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 …

Use Mark as Final to make your Word, Excel, or PowerPoint file read-only. When you mark as final, typing, editing commands, proofing marks are disabled or turned off, and the file …

In the Read, Change, and Full Control box, enter a new e-mail address or name of the person or group of people that you want to assign an access level to. To remove a person or group of …

Enable editing in your document If you receive or open a document and can't make any changes, it might be Open for viewing only in Protected View. One of the options below can help you:

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 …