How to password protect a document in Word on Mac: steps for Microsoft 365

Before you start in Word for Mac

You need the Word desktop app on your Mac. Microsoft's support page says the password steps work in Word for Microsoft 365, Word 2024, Word 2021, Word 2019 and Word 2016. If you run an older version, the steps should match, but check your Review tab before you rely on them.

Open the file in the desktop app, not in a browser tab. A file that opens in the browser runs in Word for the web. Word for the web cannot password-encrypt a document, and it cannot edit a file that already has a password. Click Open in Word to move the file into the desktop app.

Microsoft's release notes list Word 16.114.3, build 26102720, dated October 27, 2026. The notes describe it as quality and performance improvements. They do not mention password protection, so the steps on this page should still apply. To check your version, choose Word > About Word.

Open password or modify password: which one do you need?

Word gives you two separate locks. An open password stops anyone without it from reading the file. A modify password lets people open and read the file, but they need the password to make changes. You can set either one, or both.

Choose an open password when the content itself is private. A signed contract, a client report or a file with personal details fits this case. Choose a modify password when people need to read a file but should not change it, such as a draft policy that a team reviews.

Using both locks gives the most control. It also means two passwords to remember, and that is where people get stuck. If you need only one lock, fill in one field and leave the other empty.

A worked example: locking a contract and a draft

Say you finish a service contract that a client must sign. You want only the client and your legal team to read it. Set an open password, store it in your password manager, and send it to the client in a separate message.

The same week, you share a draft proposal with a group of colleagues for comment. They need to read it, but you do not want anyone to change your version. Set only a modify password. Anyone can open the file, but changes need the password you keep.

The two files need different locks because each one has a different job. Decide who does what with each file first. Then open Protect Document and set the lock that matches.

Choose a password Word will accept

Microsoft says Word for Mac passwords are case-sensitive and can be up to 15 characters long. Case matters, so Budget and budget do not match. Type the password the same way every time.

• Keep it at 15 characters or fewer, the limit Microsoft gives.
• Check Caps Lock before you type, because a case-sensitive password fails when one letter is wrong.
• Retype it exactly when Word asks you to confirm.
• Store it in a password manager before you click OK.
• Do not reuse the password from your Apple ID or your email account.

Short passwords are easy to guess. For a sensitive file, use a random mix of letters, numbers and symbols that fits within the limit. A phrase you can type easily suits a low-risk draft, but it is weaker against guessing.

Remove or change the password later

To remove a password, open the file with its current password. Go to Review > Protect > Protect Document, clear the password field or fields, click OK, and save. Tufts University IT describes the same method: repeat the steps without a password, then save.

To change a password, open the file, return to Protect Document, and type the new password in the field. Confirm it, click OK and save. You need the current password to open the file, so have it ready before you start.

Test the lock before you send the file

Close the document after you save it. Reopen it from Finder or from Word's recent files. Word should ask for the password before it shows the content. If the file opens with no prompt, the protection did not save, so go back to Protect Document and repeat the steps.

Test the modify password too. Open the file and try to make a small edit. Word should ask for the modify password before it lets you change the text. Close the file without saving if you only wanted to check the lock.

Send the password safely

Do not put the password in the same email as the file. Send it in a separate message, or in person, and tell the recipient which lock it opens. A password on a file is only as safe as the way it travels.

Think about who will need the file later. If a colleague leaves, they take the password with them unless you recorded it somewhere the team can reach. Keep a note in your password manager under the file name.

Forgetting passwords is common. Bitwarden's 2025 World Password Day survey found that 55% of respondents had abandoned an account or created a new one to avoid a password reset. Among Gen Z respondents, 30% say they often or always forget passwords to important accounts. The survey covered over 2,300 employed adults in six countries. Bitwarden sells password software, so treat the figures as a signal rather than a national count.

What to do if you forget the password

Word cannot recover a document password you forget. Microsoft says so on its support page. An administrator can help only if the DocRecrypt tool was in place before the password was created. For most people, that means the file stays locked.

Your best protection is a second copy. Keep an unprotected version in a secure place, or save the password in a password manager before you lock the file. A copy costs little. A locked file with no password can cost you the whole document.

Why Word for the web will not protect your file

Microsoft says Word for the web cannot password-encrypt a document. It also cannot edit a document that is already encrypted. If the file opens in your browser, the Protect Document steps will not work there.

The fix is simple. Click Open in Word, then follow the steps on this page in the desktop app. If a colleague sends you an encrypted file that will not edit in the browser, open it in the desktop app and enter the password there.

The incorrect password error on Mac

Some people see Word say the password is incorrect even when they type what they remember. A Microsoft Q&A thread describes this on Word for Mac. The moderator suggested clearing Office entries in Keychain Access and restarting. The original poster said the error stayed, and the thread has no marked fix.

Start with the basics before you touch Keychain Access. Turn off Caps Lock, type the password slowly, and try the file on another Mac if you have one. If the password still fails, use your backup copy.

Older guides point to the Tools menu

Some older Mac guides, and one Microsoft Q&A answer, send you to Tools > Protect Document. That answer was about removing personal information from a file in Word for Mac version 16.108.1. The Tools menu can open a different dialog, so read the labels before you set a password.

The Tufts University IT guide gives the same Review path as Microsoft. Its footer shows Copyright 2018, so its screenshots may predate the current menus. Trust the written steps, and check what you see on your own screen.

Windows path for mixed teams

If someone on your team uses Windows, the path starts differently. On Windows, go to File > Info > Protect Document > Encrypt with Password. Microsoft says the file must be saved for the password to take effect.

Agree on one method across the team before you share files. Everyone should know which lock to expect and where to find the setting on their own computer.

Mistakes people make with Word passwords

• Setting the password and closing the file without saving. The lock does not hold until you save.
• Using the open password when the team only needs to read and comment.
• Typing the password with Caps Lock on, then confirming it with Caps Lock off.
• Sending the password in the same email as the file.
• Assuming the password stops someone from copying the text.
• Locking the only copy of a file with a password nobody wrote down.

What a Word password does not protect

A Word password protects the file while it is closed. Anyone with the password can open it, copy text, paste it into another document or take a screenshot. The password does not follow the words once they leave the file.

For sensitive documents, a password is one layer. Limit who gets the file, delete old copies and use your organization's sharing tools. Password protection works best alongside those habits.

Where to go next

If your document also needs a review before it goes out, read How to turn on Track Changes in Word on Mac. For a page-level look at what Lazur can point at inside Word, see AI assistant for Word on Mac. You can get the Mac app from the download page.