Last updated on
Jan 16, 2026
Lock PDF and Add Watermark to PDF for MSFT For Free
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Up to 100 MB for PDF and up to 25 MB for DOC, DOCX, RTF, PPT, PPTX, JPEG, PNG, JFIF, XLS, XLSX or TXT
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Generate new PDFs from scratch or transform existing documents into reusable templates. Type anywhere on a PDF, rewrite original PDF content, insert images or graphics, redact sensitive details, and highlight important information using an intuitive online editor.
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Say goodbye to error-prone manual hassles. Complete any PDF document electronically – even while on the go. Pre-fill multiple PDFs simultaneously or extract responses from completed forms with ease.
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Add, remove, or rearrange pages inside your PDFs in seconds. Create new documents by merging or splitting PDFs. Instantly convert edited files to various formats when you download or export them.
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Transform static documents into interactive fillable forms by dragging and dropping various types of fillable fields on your PDFs. Publish these forms on websites or share them via a direct link to capture data, collect signatures, and request payments.
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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:
Super awesome! I love how you are not overpriced. Super easy to use. I have recommended this to everyone in my office. So many programs rolled into one!!! Thank you!!!
2019-12-18
What do you like best?
This has saved me some much time on filling out all my documents & storing them as well !!! I just love how you can erase information & add other items to it as well!
What do you dislike?
Sometimes it does have a hard time reading some of the documents & uploading them correctly . I then have to restart the program a couple of times before it actually is able to load the document .
What problems are you solving with the product? What benefits have you realized?
With this software i am able to edit all my PDF'S add & delete any information that needs to be revised & have an amazing clean, clear & legible PDF's for my clients to view!!!
This has saved me some much time on filling out all my documents & storing them as well !!! I just love how you can erase information & add other items to it as well!
What do you dislike?
Sometimes it does have a hard time reading some of the documents & uploading them correctly . I then have to restart the program a couple of times before it actually is able to load the document .
What problems are you solving with the product? What benefits have you realized?
With this software i am able to edit all my PDF'S add & delete any information that needs to be revised & have an amazing clean, clear & legible PDF's for my clients to view!!!
2019-08-15
What do you like best?
Frantically searching for a way to fill out a PDF form without losing all of your work? PDFfiller works great, does just what it says on the tin, and has the best customer service I've experienced with a website.
What do you dislike?
Though I was wary of a paid service at first, their customer service was as helpful as any I've ever experienced and the product works as promised.
What problems are you solving with the product? What benefits have you realized?
Filling out forms as a graduate student working far far away from campus, PDFfiller helps me get it all in order without a struggle. It simply makes life easier.
Frantically searching for a way to fill out a PDF form without losing all of your work? PDFfiller works great, does just what it says on the tin, and has the best customer service I've experienced with a website.
What do you dislike?
Though I was wary of a paid service at first, their customer service was as helpful as any I've ever experienced and the product works as promised.
What problems are you solving with the product? What benefits have you realized?
Filling out forms as a graduate student working far far away from campus, PDFfiller helps me get it all in order without a struggle. It simply makes life easier.
2019-08-30
Great to mark up documents.
I like this software and they have a money back guarantee of 100 days I believe.
I use this product to mark up documents and sign. I like to keep everything that I do 100% electronic, so with products like this, I am able to do so.
I haven't found anything wrong with this software. It is great for any industry who deals with electronic PDF files.
2018-11-19
Quality customer service
I would like to say that pdFiller is a platform business that cares about their customers ! And offers assistance and support quickly and efficiently. We will continue to recommend them foe this reason.
2021-02-22
SO FAR I'M HAPPY WITH THIS PROGRAM IT…
SO FAR I'M HAPPY WITH THIS PROGRAM IT HAS HELPED ME OUT A LOT AND THE CHAT HELP IS VERY HELPFUL. ON CHAT WAS VERY KNOWABLE ABOUT WHAT I NEED TO BE DONE.
2020-06-06
Lock PDF and Add Watermark to PDF for MSFT
Protect your PDF documents with our Lock PDF and Add Watermark feature for MSFT. This tool offers an easy way to secure your sensitive information while maintaining a professional appearance.
Key Features
Secure password protection for PDF files
Customizable watermarks for branding
User-friendly interface for easy navigation
Compatibility with various MSFT applications
Quick processing time for large documents
Potential Use Cases and Benefits
Securing confidential business documents
Protecting intellectual property and sensitive data
Branding documents with personalized watermarks
Preventing unauthorized distribution of documents
Enhancing professionalism in document presentations
Our tool addresses the need for document security and branding in a simple way. By locking your PDFs, you prevent unauthorized access, while watermarks help establish ownership and authenticity. Transform your PDF management experience, gain peace of mind, and ensure your documents reflect your brand's integrity.
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 do I add a watermark to a secured PDF?
Step 1: Run PDF Watermark Tool and add PDF files to watermark.
Step 2: Enter text to insert as watermark.
Step 3: Select a new location to save the PDF file.
Step 4: Click on add watermark to PDF file.
How to Lock PDF and Add Watermark to PDF for MSFT - video instructions
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