Lock PDF and Compress PDF for Windows 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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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
High Performer - Summer 2025
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:
Though perhaps a bit expensive, PDFfiller.com is extremely well-designed, feature-rich and easy to use. While I have no complaints about the basic product, I was bothered by design feature that seemed to insist that I enroll in a more expensive tier of service without giving me the chance to opt out or cancel. Any popup page that requires a user to select - and pay for! - a more expensive service level should always include "close" and "cancel" options. While I'm still a bit troubled by this aspect of PDFfiller's site design, when I raised the issue with your support staff, Ellilou Ilano quickly responded and helped resolve my problem.
Adam R B
2015-02-25
Only thing it is lacking is the OCR - If it would have had this ability to edit scanned pdf document like PDF element - then it would have been the best!
Mazharul I
2018-09-05
Quick, easy, and efficient Amazing Makes building and filling out forms a breeze. The automation is great in making sure all information is included and correct. I have had no bad experiences with this software thus far.
Alex B.
2022-09-08
PdfFiller has been a Lifesaver PdfFiller has been a lifesaver! I have a very important legal matter that has a lot of documents that I either have to fill out or submit. All of which either have to be created, modified, filled out, or signed. Since the matter is being handled across the country, its a lot of pressure off me to be able to edit, create, and save these documents.
Anthony
2022-08-08
Cancelling a subscription can be an intimidating and anxiety creating experience. NOT WITH THESE PEOPLE!!! Today I logged in to my account. ***** linked in as my Chat contact and in less then 1 minute the subscription was taken care of for me!!!! I have had to fight too many providers about cancelling subscriptions so THIS WAS REFRESHING!!! Such a contrast and it makes me want to stay connected with them if I ever need their services again.Don't hesitate to access their services and products.
Harold C
2022-02-14
I made a mistake and accidentally… I made a mistake and accidentally signed up for this service. When I got the bill for $96, I was shocked. I thought it was going to be such a hassle and was so pleasantly surprised. I got a full refund within an hour of writing to them with a very nice note.
donnalou stevens
2021-08-10
I started using PDFfiller 2013 I started using PDFfiller in 2013. Recently, my company started providing a program that was free to me. I canceled my subscription thinking to save some money. It only took 4days to realize I wanted PDFfiller back! This program is so simple and straightforward. I have shared this program with many over the years and they always come back thrilled with it. Lawyers, accountants, I am in real estate and always dealing with leases, riders, applications etc. It is worth the $$!
RK Wood
2021-07-17
We were trying to print a government… We were trying to print a government form. It kept going to buy a package wjhich we already had. Kara was able to one time purchase the supream package so we could print and then she bot us back on the basic plan. She was very helpful. Thank you!!!
Chris Bosworth
2021-07-14
So easy to use So easy to use. I filled in 3 very long PDF forms and they look so much better typed than filled in with my scruffy handwriting. I'll definitely use this service again.
Jenny W
2020-10-19

Lock PDF and Compress PDF for Windows

Secure, manage, and optimize your PDF documents with our Lock PDF and Compress PDF feature for Windows. This tool helps you ensure your sensitive information is protected while making your PDFs more accessible.

Key Features

Password protection for your PDF files
Reduce file size to improve sharing and storage
Easy-to-use interface for quick document management
Support for batch processing to save time
Compatible with various PDF formats

Use Cases and Benefits

Protect confidential documents for business transactions
Compress large files for efficient email sharing
Store multiple PDFs securely without consuming much space
Easily manage and organize files for presentations and reports
Enhance document delivery speed by reducing file size

This feature addresses your need for both security and efficiency. By locking your PDFs, you can keep your personal and professional information safe from unauthorized access. Additionally, compressing your files ensures they take up less space, making it easier for you to share and manage your documents. Experience control over your PDF files 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
Go to the Compress PDF tool. Drag and drop your PDF file into the tool, choose 'Basic Compression'. Wait for us to work on reducing its file size. Click download to save your PDF document.
Start with making a copy of your PDF file (the document will replace the original one), next, open the PDF inside Preview, next head to File > Export > from the Quartz-Filter drop-down menu select Reduce File Size option and click the Save button.

#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