If you want people to view but not edit a document, share the document with them, but restrict their permissions to view-only. Here’s how:
In Word for the web, click Share.
In the Share dialog, in the Add people box, enter the email addresses of the people you want to share your document with.
From the dropdown menu, select Can view. This will allow recipient to view the document, but they will not be able to make changes.
Select Share.
Word for the web emails a link to the people you want to share your document with.
Note
Sharing a document as view-only doesn’t prevent someone from downloading a copy of the document and making changes to their copy, but it does keep your original file intact.