It only takes a few clicks to Lock PDF Files in Microsoft’s mobile OS 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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Discover the simplicity of processing PDFs online

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Upload your document in seconds
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Fill out, edit, or eSign your PDF hassle-free
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Download, export, or share your edited file instantly
Top-rated PDF software recognized for its ease of use, powerful features, and impeccable support
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Every PDF tool you need to get documents
done paper-free

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Create & edit PDFs

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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Fill out & sign PDF forms

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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Organize & convert PDFs

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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Collect data and approvals

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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Export documents with ease

Share, email, print, fax, or download edited documents in just a few clicks. Quickly export and import documents from popular cloud storage services like Google Drive, Box, and Dropbox.
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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.

Customer trust by the numbers

64M+
users worldwide
4.6/5
average user rating
4M
PDFs edited per month
9 min
average to create and edit a PDF
Join 64+ million people using paperless workflows to drive productivity and cut costs

Why choose our PDF solution?

Cloud-native PDF editor

Access powerful PDF tools, as well as your documents and templates, from anywhere. No installation needed.

Top-rated for ease of use

Create, edit, and fill out PDF documents faster with an intuitive UI that only takes minutes to master.

Industry-leading customer service

Enjoy peace of mind with an award-winning customer support team always within reach.

What our customers say about pdfFiller

See for yourself by reading reviews on the most popular resources:
I like that my information is saved and I do not have to keep writing over my applications. I can get it quickly when I see a job I want to apply for.
nabeth w
2015-10-13
I just started to use PDFfiller and like the ease of completing pdfs, and logical flow of the app! Also love the send fax feature although while it seemed to work well from the desktop app, it seemed to hang when faxing from my galaxy Note 4 (just kept spinning and I had to force stop the app)-- will have to try faxing more to see if it was a device or app issue.
Rick S
2016-07-28
I had some initial problems (undoing things and a pop-up overtime I used text boxes). Customer support representative Ellie guided me through it and was able to resolve most of my problems. I still wish I could use the text boxes without the pop-up though. I believe at this time it is not possible.
Maritza M
2016-11-04
Works well but continues to have security issues in connecting with my Google Drive account. Each time I open a PDF in Drive using the PDFFiller App, I get an Unsafe warning. Please clear this problem up. I don't have the time or energy to do your survey right now, perhaps in the future.
Muireann Ni S
2018-05-15
What do you like best?
As a beginner, I was surprised not only with the fact that PDFfiller was so much easier to learn and use than the Adobe Suite but also at the range of capabilities on offer! From my first use of this online program I found new pleasure in dealing with .pdf files. I now use the program Every Single Day to create, manipulate or convert files that used to sit waiting, sometimes for days at a time, to be done by the one or two people with access to more expensive and less user friendly programs. Now I have a new "can-do" attitude to the workings of .pdf files. I can't recommend this online tool enough and it's so affordable, you can buy a license to use at home. Great product, lots of advantages. You will not look back, you will not regret this purchase.
What do you dislike?
The user Interface could do with being a little less busy. A streamlined interface and a compact "how to..." would take a 9/10 to a 10. It just needs some tweaking and it's perfect!
Recommendations to others considering the product:
In my opinion it is definitely worth spending the small amount to upgrade to the paid version!
What problems are you solving with the product? What benefits have you realized?
Administration issues generally...adding text, file conversion and commenting on documents...are all problems that I had to either pay to have done elsewhere or ask for an expensive subscription that was never in my budget and wouldn't be approved if I had asked.
Samantha Miller (Venezia)
2019-01-28
What do you like best?
Very easy to use. Not complicated at all. Compatible with every file I needed so far. I don't know how we got by before this program. I haven't come across anything I haven't liked yet. A great value for the price.
What do you dislike?
Wow. I dislike this question! I really love your product and haven't had anything I dislike.
Recommendations to others considering the product:
Great Value Easy to use all around wonderful company
What problems are you solving with the product? What benefits have you realized?
We are able to send files in real time as simply as sending an Email. You can have each person input their own data as well as sign documents all without having to print anything out. Of course that is huge in helping the environment.
Administrator in Real Estate
2019-01-28
What do you like best?
It works. Easy to use platform. I've subscribed for several years and they continue to make improvements. I tried docusign and this was just as good.
What do you dislike?
I don't like that it won't link up with business accounts on OneDrive so I can't store my files on OneDrive. Really would be nice to have them fix that! Also for some weird reason, the system only can connect with personal accounts. Sometimes, it's not easy to find my documents. Finally, the plug-in for Chrome doesn't always work well. Usually, it's just better to go into the app itself.
Recommendations to others considering the product:
Compare the functionality you need to what it offers. I suspect you'll find it's sufficient.
What problems are you solving with the product? What benefits have you realized?
Send out paperwork for signatures and fill out paperwork online instead of printing, signing, and scanning it.
User in Real Estate
2019-10-07
kara was great kara was great. I am an older computer geek who never got into such things as screenshots. Not only did kara patiently deal with my problem but she also helped me with her request of a screen shot. i have 2nd and 3rd level support at ibm on global WAN's so i have an appreciation for what Kara did for me. Please give her kudo's and preferably a raise for dealing with an older computer geek
Robert Bruce Scott
2021-10-28
I am using the service to help with…updating documents I am using the service to help with documentation and transferring data. I was pleased to have good customer service, when I needed it, with prompt response time and helpful tools to fix the problem.
Jennifer Rappole
2021-02-04

Do business more productively and Lock PDF Files in Microsoft’s mobile OS

When it comes to PDF files, different operating systems have various problems. Some of them only allow a partial editing, and some have no software at all for modifying PDFs (only viewing). Avoid spending hours looking for a program that’s compatible with your device and allows you to Lock PDF Files in Microsoft’s mobile OS.

Streamline your work and use pdfFiller, a powerful solution for efficient document management. Just confirm your network and open pdffiller.com to reach our professional online editor.

What you get when you Lock PDF Files in Microsoft’s mobile OS with pdfFiller:

01
Simplicity. Start editing PDFs like a pro without tutorials. The interface is user friendly and straightforward.
02
Flexibility. Stop worrying about compatibility issues. The tool works well on all major platforms.
03
Security. Feel safe with bank-level security and compliance. The data uploaded and added is secured with advanced encryption methods.
04
Integrity. Combine the PDF editor with a wide variety of available clouds, CRM systems, or databases. The vast number of cloud storages available makes moving documents fast.
05
Validity. Utilize legally-binding eSignatures. The eSignatures created in pdfFiller can be used in court.

Boost document management-related tasks with the right tools and features with our app. Improve your workflows today!

Lock PDF Files in Microsoft’s Mobile OS

Protect your sensitive documents with the Lock PDF Files feature available on Microsoft’s mobile operating system. This tool helps you secure your PDF files, ensuring that only authorized users have access. Discover how this feature can benefit you today.

Key Features

User-friendly interface for easy navigation
Password protection for individual PDF files
Ability to lock and unlock PDF files swiftly
Seamless integration with other Microsoft apps
Options for sharing locked PDFs securely

Potential Use Cases and Benefits

Safeguard personal documents like tax forms, contracts, or medical records
Prevent unauthorized access to business files during mobile presentations
Ensure compliance with data protection regulations by locking sensitive information
Share locked PDFs with colleagues while keeping data secure
Easily manage access for different users with password protection

The Lock PDF Files feature addresses your concern about document security. With increasing instances of data breaches, ensuring your important PDFs are protected is crucial. This solution gives you control over who views your files, allowing you to focus on your tasks without worrying about unauthorized access.

Get documents done
from anywhere

Create, edit, and share PDFs even on the go. The pdfFiller app equips you with every tool you need to manage documents on your mobile device. Try it now on iOS or Android!

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
Protect a document with a password 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.
Open the PDF and choose Tools > Protection > Encrypt > Encrypt with Password 6. If you receive a prompt, click Yes to change the security. 7. Select Require A Password To Open The Document, then type the password in the corresponding field.
How to set a password to protect PDFs on Android. Begin by navigating to the password protection page on your preferred browser. Click the Select A File button to choose and upload your PDF. Create a password and enter the password, then retype it to confirm.
Click the Select a file button above or drag and drop a PDF into the drop zone. Enter a password, then retype it to confirm the password. Click Set password. Download the password protected PDF document or sign in to share it.

Video instructions on how to Lock PDF Files on Microsoft’s mobile OS

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