Use Restrict Editing to protect parts that can or can't be changed, who can make changes, find areas you can edit, or unlock a protected document.

Click Review > Restrict Editing. Under Editing restrictions, check Allow only this type of editing in the document, and make sure the list says No changes (Read only).

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:

Select Info, choose Protect Document, point to Restrict Permission by People, and then select Restricted Access. In the Permissions dialog box, select Restrict permission to this document, …

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 …

You can lock only specific cells and ranges before you protect the worksheet and, optionally, enable specific users to edit only in specific ranges of a protected sheet.

Restrict changes to PowerPoint presentations If you don't want content reviewers to accidentally change your PowerPoint presentation, you can use formatting and editing restrictions.

If you select Edit Anyway, the document is no longer read-only. Encrypt documents with a password Open the document that you want to password protect. Select File > Info. Select …

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 …

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 …