There is one current Mac-specific issue worth checking first. Microsoft says that starting July 13, 2026, some Microsoft 365 and perpetual Office users on macOS can enter reduced functionality mode if the required Office update has not been installed. In that state, Word can open and print files but cannot edit, save, or create documents. If every Word file suddenly became effectively read-only—not just one document—update macOS if needed, then update Word before changing individual file permissions.
Microsoft’s current guidance says the required Office updates need macOS 12 Monterey or later. For Office installed from Microsoft, open Word and choose Help → Check for Updates, then install all available updates through Microsoft AutoUpdate and restart Word. If Word came from the Mac App Store, update it through the App Store instead. See Microsoft’s current macOS/iOS Office update notice and Office for Mac update instructions.
If only one document opens read-only while other Word files edit normally, skip the app-wide update diagnosis and focus on that file. The rest of this guide goes from the safest, most likely checks to the more specific permission and protection cases.
| Test | What the result suggests | Best next move |
|---|---|---|
| Create a new blank document and type a sentence | If you cannot edit or save it, the problem is probably Word, licensing, or the current Office update state | Start with Step 1 |
| Open a different local .docx file | If that file edits normally, the original document is probably protected, locked, or stored somewhere you cannot write | Start with Step 2 |
| Save the problem file to your local Documents folder under a new name | If the copy is editable, the original location or sharing permission is likely the issue | Check Step 3 and Step 4 |
The July 2026 reduced-functionality change is the first thing to rule out when the problem affects many documents at once. Microsoft says affected Office apps can still open and print files while editing, saving, and creating are disabled. That symptom can look exactly like a file-permission problem even though the document itself is fine.
For a Microsoft-installed copy of Word:
If the update cannot be installed because your Mac is on an older unsupported macOS release, use Apple menu → System Settings → General → Software Update and update macOS if your hardware supports it. On a work-managed Mac, the update may be controlled by IT rather than by you.
Also check Word activation. This is especially relevant if Word was installed from the Mac App Store. Microsoft states that the Mac App Store versions of Word, Excel, and PowerPoint require a Microsoft 365 subscription to create and edit documents. A one-time Office license is not compatible with the App Store build; those licenses require the Office apps downloaded directly from Microsoft. See Microsoft’s Mac App Store activation guidance.
Use this fix when: new documents and multiple unrelated files are all non-editable.
Do not use this diagnosis when: Word edits other files normally and only one document is read-only. In that case, updating Word may still be sensible, but it is unlikely to explain the single-file behavior.
Check the result: create a new blank Word document, type a line, and save it. If that works, Word itself has editing capability and you can move to file-specific checks.
Word can open a document in Viewing mode even when the file itself is not locked by macOS. Microsoft documents three document modes in current Word for Mac: Viewing, Reviewing, and Editing. If you have edit permission, use the mode selector near the upper-right of the Word window and switch from Viewing to Editing. See Microsoft’s official Word document modes guide.
A document can also have Word-level restrictions. Microsoft documents an Always Open Read-Only setting and editing restrictions that an author can apply to a Word document. On current Word versions, look under the document’s protection options and clear the read-only preference if you are allowed to do so. If the file is protected against modification with a password, Word for Mac supports a separate password-to-modify setting under Review → Protect → Protect Document.
If you do not know a required password, do not try to bypass the protection. Microsoft states that Word cannot recover a forgotten document password. See Microsoft’s Word password-protection documentation.
Use this fix when: the file opens normally but Word shows Viewing/Read-Only behavior, or the document came from someone who may have intentionally restricted editing.
Important distinction: “Always Open Read-Only” is a Word preference for how the document opens. It does not give you edit rights to a OneDrive or SharePoint file that was shared with view-only permission. Microsoft explicitly separates viewing mode from the underlying access permission.
Check the result: switch to Editing if it is available, type a harmless test character, then undo it and save. If Editing is unavailable or saving is still blocked, move on to macOS file permissions.
macOS has its own file-level controls. A Word document can be locked in Finder or stored in a location where your Mac user has only read permission.
First check the file itself:
.docx file.Apple’s documentation says the Finder Locked control can prevent a document from being changed, and its permissions guide defines Read & Write as permission to open and change an item. See Apple’s Lock a document on Mac and Change permissions for files, folders, or disks on Mac documentation.
If the file itself says Read & Write but Word still cannot save it, inspect the folder containing the file as well. Saving often requires permission to modify the directory, not merely permission to read the existing document.
Use this fix when: a local file is read-only, especially after being copied from another Mac user account, restored from backup, moved from a shared folder, or stored on external media.
Do not change permissions broadly: avoid using “Apply to enclosed items” on large system or shared folders unless you understand the consequences. Change the specific document or folder that actually needs writable access.
Check the result: reopen the document and try a normal Save. If it still fails, use Save As to a folder you definitely own, such as your personal Documents folder.
OneDrive, SharePoint, and Teams documents have their own sharing permissions. Microsoft says a user with Can view permission can read the file but cannot change it, while Can edit grants editing rights. Word cannot override a view-only sharing permission just because the desktop app is installed on your Mac.
If the document belongs to someone else, open the sharing or access information and check whether you have edit rights. If you only have view permission, ask the owner to grant Can edit. Microsoft documents these controls in its OneDrive and SharePoint permissions guide.
If you do not need to modify the shared original, use File → Save As and create a separate copy in a location where you have write permission. This is appropriate when the original is intentionally read-only and you only need your own editable version. It is not appropriate when your organization requires edits to stay in the controlled shared file.
Choose a new name and a writable folder, then save the copy:
Use this fix when: the original is shared as view-only, belongs to someone else, or is stored in a location where you cannot write.
Check the result: close the original, open the new local copy, edit a sentence, and save. If the copy works, Word is functioning and the original file or location is the restriction.
If a Word document is stored on an external disk, the disk format can matter. Apple notes that NTFS drives are read-only on Mac for normal macOS use, so you may be able to open a document from the disk but not save changes back to the same location. Apple documents this behavior in its Mac file-copy troubleshooting guide.
A simple test is to copy the Word document from the external drive to your Mac’s Documents folder and open the copy. If it becomes editable, the storage volume—not Word—is probably the limiting factor.
Do not reformat a drive just to fix one Word document unless you have confirmed the file system is the issue and backed up the drive first. Reformatting erases data.
Word for Mac allows an author to set one password for opening a document and another for modifying it. A file can therefore open successfully yet still refuse editing unless the modification password is supplied.
If you own the document and know the password, remove or change the protection through Word’s protection settings and save the file. If someone else owns it, ask them for an editable version or the required permission. Microsoft warns that Word cannot retrieve a forgotten document password.
A read-only document usually does not justify deleting Word preferences, reinstalling Office, changing macOS security settings globally, or using Terminal commands to recursively modify file permissions. Those actions can create new problems while leaving the original cause untouched.
Use the symptom to choose the fix:
Once you think the problem is fixed, verify it rather than assuming that the absence of a read-only banner means everything is writable:
If a new local document is editable but the original still is not, the remaining cause is almost certainly specific to that document, its protection settings, its owner’s sharing permissions, or its storage location. If even a new blank document cannot be edited or saved after Word is updated, signed in, and activated, use Microsoft Support or your organization’s IT team rather than changing individual file permissions repeatedly.
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