Last updated on
Sep 21, 2025
Lock PDF and Password Protect PDF for Microsoft For Free
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Store documents safely
Store an unlimited number of documents and templates securely in the cloud and access them from any location or device. Add an extra level of protection to documents by locking them with a password, placing them in encrypted folders, or requesting user authentication.
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What our customers say about pdfFiller
See for yourself by reading reviews on the most popular resources:
Less than satisfactory. I filled in a document. Made a mistake with one numeral and have yet to be able to \correct it. I 've being trying for 2 hours mwith no luck
2016-04-11
It was interesting using the PDFfiller on two different computers. On one I couldn't get the scroll down bar easily, whereas on the other it was simple. Don't know why. I also noticed that there were different options to determine exactly where on a line you could type, however, it was difficult to gauge.
FYI: I just started using this application.
2017-05-03
VERY GOOD PRODUCT. WISH IT HAD "ADD/SUBTRACT" FUNCTIONS, WHICH WOULD PRECLUDE THE NEED FOR DOING SO MANUALLY AND THEN INSERTING TOTALS/SUBTOTALS MANUALLY.
2018-06-17
Great Product!
I love this software; it has been invaluable. I have used it to fill out job applications, insurance, medical & school documents. I'll continue to use it.
It is very easy to upload documents to this software. Editing is user-friendly even for those not technically savvy. I like that I have many options in saving or exporting my finished document. Also, I like that my previous documents are saved because there has been more than once that a document has been lost or needed again. I have been saved by the fact that PDF Filler has the previously used document saved.
I have not found anything I really dislike about this software. I'll be honest in that I'm not crazy about the price but I have found this software so helpful I have been using it for over two years now. I've recommended it to several people. I did not rate the customer service because I have never used it. I guess the fact that I've been using this for over two years & never had a customer service issue speaks for itself.
2019-05-16
Very pleased
easy to navigate & fill in the forms that I use for our business
hard to find forms that i actually use. Seems every time I am looking for a specific form,It cant be found
2019-01-22
I subscribed to the PDF filler app on…
I subscribed to the PDF filler app on Google. And without asking me they charged me. Then I contacted them and they didn't want refund my money until I told them that I was going to let everybody know about their app.
2023-04-16
What do you like best?
GREAT to use, has lots of options and you can upload almost anything!
What do you dislike?
I wish that there were more options, like adding icons, or company stamps. I also have found sometimes when I download it there are lines that run through it, very frustrating when it took like an hour to manipulate a document, and it won't upload without random lines.
What problems is the product solving and how is that benefiting you?
Specifically AIA forms for commercial contracting, such a great tool!
2022-11-03
The application is good and offers…
The application is good and offers trials time but charged your money straight away, luckily the support said the money will be refunded back into my bank account.
2022-03-31
I had an issue, and customer service reached out right away to offer help!
I will use them from now on, good service makes all the difference!
Thank you! **
2020-06-04
Lock PDF and Password Protect PDF for Microsoft
Secure your documents with the Lock PDF and Password Protect PDF feature for Microsoft. This tool helps you manage access to your sensitive information effectively. You can lock your PDFs and limit who can view or edit them, ensuring that your data remains protected from unauthorized users.
Key Features
Easy PDF locking with a few clicks
Custom password settings for enhanced security
User-friendly interface for seamless navigation
Support for all Microsoft PDF documents
Ability to restrict printing and editing functions
Potential Use Cases and Benefits
Protect confidential business documents
Secure personal information like tax returns
Share sensitive files with clients safely
Control access to academic research papers
Prevent unauthorized changes to legal agreements
This feature addresses your need for privacy and control over important documents. By locking your PDF files and setting a password, you eliminate the risks of data breaches and unauthorized access. Whether you are a professional sharing sensitive materials or an individual safeguarding personal information, this tool empowers you to work confidently.
For pdfFiller’s FAQs
Below is a list of the most common customer questions. If you can’t find an answer to your question, please don’t hesitate to reach out to us.
What if I have more questions?
Contact Support
How do I password protect a PDF with Microsoft Office?
First, open the Office document you would like to protect. Click the File menu, select the Info tab, and then select the Protect Document button. Click Encrypt with Password. Enter your password then click OK.
How do I password protect a PDF in Office 365?
Go to File > Info > Protect Document > Encrypt with Password.
Type a password, then type it again to confirm it.
Save the file to make sure the password takes effect.
How to Lock PDF and Password Protect PDF for Microsoft - video instructions
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