How to Save a Document as a Password-Protected PDF in Microsoft Word

When sharing sensitive information like a financial report, a legal contract, or employee payroll data, sending a standard Microsoft Word document via email is highly insecure. Not only can the recipient easily edit the document, but anyone who intercepts the email or accesses the recipient’s computer can read the contents freely.

To ensure your data remains secure and unalterable, you should export the document as a PDF and apply a strict password. Microsoft Word includes a built-in encryption tool that allows you to lock a PDF during the export process, ensuring that only individuals with the correct password can even open the file.

How to Export and Encrypt a PDF in Word

You do not need to download third-party software like Adobe Acrobat to lock a PDF; Microsoft Word handles the encryption natively using secure AES algorithms.

1. Open the sensitive document in Microsoft Word.
2. Review the document to ensure all formatting is final.
3. Click on File in the top-left corner of the ribbon menu.
4. In the blue sidebar on the left, click on Export.
5. In the center pane, select Create PDF/XPS Document.
6. Click the large box labeled Create PDF/XPS.

A standard Windows “Save As” dialog box will appear, asking you where you want to save the new PDF file.

Applying the Password

Before you click the “Publish” button to save the file, you must configure the security options.

1. Look at the bottom of the “Save As” dialog box, right below the “Optimize for” section. Click the Options… button.
2. A new “Options” window will pop up. Scroll to the very bottom of this window.
3. Check the box labeled Encrypt the document with a password.
4. Click OK.
5. The “Encrypt PDF Document” security window will immediately appear.
6. Type a strong, complex password into the first box. (Do not use simple passwords like “12345” or “password”).
7. Type the exact same password into the second box to confirm it.
8. Click OK.

You will be returned to the main “Save As” dialog box. Choose the folder where you want the file to live, give it a recognizable name, and click Publish.

What Happens Next?

Microsoft Word will take a few seconds to generate the PDF, apply the cryptographic lock, and save it to your specified folder. The original Word document remains open on your screen and remains completely unlocked. (If you want to password-protect the original Word document as well, you must go to File > Info > Protect Document).

Now, test your new PDF.

1. Navigate to the folder where you saved the PDF and double-click it.
2. Whether it opens in Adobe Reader, Google Chrome, or Microsoft Edge, the application will immediately pause and display a security prompt.
3. The screen will remain blank, and a box will demand the password.
4. If a user types the wrong password, the file refuses to open. There is no “Forgot Password” link or backdoor recovery option.

Crucial Warning: Because there is no recovery mechanism, if you forget the password you applied to the PDF, and you delete the original Word document, that data is permanently lost. Always keep a secure backup of the original file, or store the PDF password in a secure Password Manager.

When sending the locked PDF to a colleague, never send the password in the same email. Send the PDF via email, and text the password to their phone, or send it via a secure messaging app like Signal. If a hacker intercepts the email, they will have the locked file, but no way to open it.