Lock PDF and Merge PDF for Windows For Free

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Last updated on Dec 12, 2023

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
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
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Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025

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:
It took a while to begin to understand how this works. I would definitely like to attend a webinar to learn more about it. After I fill in all these forms I send you, how do I save them to my computer? Thanks, Joyce Wicks
Joyce C. W
2016-06-06
This is an amazing program! How many times we all have to fill out forms, even if they are pdf forms available for downloading on line) and wish we could just fill them in with the keyboard instead of printing out a hard copy and THEN handwriting our responses. PDFfiller allows you to save a pdf and then fill it in so easily. There are also a lot of options for checking boxes, circling responses, highlighting, enlarging or shrinking text size, etc. The program is user-friendly, easy to follow, print, download to your own computer and save. Just a GREAT addition to my tools. I also get such positive feedback whenever I submit a requested form---they are delighted to have READABLE information.
Judy N
2018-01-27
Great features, love the ruler that lets you type straight every line unlike Adobe Acrobat. I really like the compatibility with mobile phones to create your digital signature. Overall I was quite happy and impressed with the software. It would be great if the trial period was longer.
Anonymous Customer
2019-01-17
It is amazing how simple this app is to… It is amazing how simple this app is to use. It is a real joy. I wish I had stumbled upon it years ago!
Anthony Testa
2019-08-06
This is my very first time doing a capability statement document PDF FILLER made my experience so easy took away all the stress and trouble of me trying to visualize the document to make sure it was perfect and correct. I appreciate this service so much.
Antionette M
2023-10-22
PDF filler that will empty your pockets. The most accurate file editor. The most reliable document converter. The master of alterations. I can email important documents immediately upon request. I can edit and sign government documents that are lifesaving for important life necessities. I.e. rental arrears. Rent ledgers. W2 forms, etc. The darn subscription is too expensive just to use for once a month, or only when necessary. They should have like, one time prepaid options instead of monthly or yearly.
Ronald S.
2022-06-22
Dee was fabulous Dee was fabulous! I was in a state of panic after not being able to find my file I had work soooo hard on for several days. She was so calm, helpful and supportive. Thank you so much!! Joyce Whitfield
Joyce Whitfield
2021-04-27
I am a Medical Billing and Coding student and have been using pdfFiller forms to do an assignment where we are using the CMS 1500 claim form, and pdfFiller has helped me a lot by allowing me to used the forms online. Thanks I appreciate that
Florence W
2020-08-08
Your service is awesome! Saves time and money from having to run all the way from home to Staples then fax/email important documents to the recipient. This service is easy to edit and save/email documents to the recipients. I really love your service!
Lucinda K
2020-04-24

Lock PDF and Merge PDF for Windows

The Lock PDF and Merge PDF for Windows feature offers an efficient way to manage your PDF files. With this tool, you can secure your documents while also combining multiple PDFs into a single file. This feature caters to professionals and individuals who need to handle sensitive information without compromising accessibility.

Key Features

Easily lock PDF documents with password protection
Merge multiple PDF files into one document
User-friendly interface for seamless navigation
Support for various PDF file formats
Quick processing to save you time

Potential Use Cases and Benefits

Protect confidential business documents from unauthorized access
Combine project files into one PDF for easier sharing and management
Create a secure portfolio by locking personal documents
Facilitate document submission processes by merging application forms
Improve document organization with streamlined file management

Whether you want to secure sensitive information or simplify your document management, our Lock PDF and Merge PDF for Windows feature addresses your needs effectively. By locking your PDFs, you can ensure that only authorized users can view your content. Merging files helps you keep related documents together, making it easier for you to access and share your work. Enjoy a straightforward solution to your PDF management challenges today.

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
Click File > Print to open the print dialog. Click the PDF menu button at the bottom of the print dialog and select Save as PDF. Enter a file name and location for your new PDF file when prompted. The new PDF file will have the same contents as the original, but no password.
File→Create for creating a new PDF file. Choose Combine Files Into a Single PDF option. Click on Add File, add all the PDF files you want to merge. Add password of the locked PDF files. Click on Combine. File→Saves to save the PDF file.
Open the app, and choose To merge or Split. If you just need to merge two documents without changing the order of any pages, choose To merge. Click Add PDFs, and select however many you want to merge. Once your documents are in order, hit Merge, and name and save the new merged PDF.
Step 1: Download PDF Shaper Free version. Step 2: Launch PDF Shaper Free. Step 3: Click Merge option to open Merge window of PDF Shaper. Step 4: Here, click the Add button to add all the PDF files that you want to merge or combine into one PDF file.
Choose Tools > Protect > Encrypt > Remove Security. Remove Security: The options vary depending on the type of password security attached to the document. If the document has a Document Open password, click OK to remove it from the document.

How to Lock PDF and Merge PDF for Windows - video instructions

#1 usability according to G2

Try the PDF solution that respects your time.
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025