Lock PDF and Add Watermark to PDF for Computer 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:
This is my first experience with PDFiller.....so far, it is good. However, I do not like that there is not a contact # to speak to someone in customer support. .
Marsha Z
2016-10-17
It's been great as a company that has numerous Prevaiing Wage projects going on at the same timer, PDF filler has enabled me to make changes on WH347 forms. PDF filler is an extreme help.
Sheila L
2018-01-08
The program very intelligently interprets PDF images, creating fields in just the right spot for us to type our responses in, while avoiding the print-write-scan-save cycle.
Busy Bee Q
2018-12-26
PDFfiller - One stop tool for PDF Editing Our organization use PDF Filler for contract completion with our clients/vendors. It allows us to insert a place for digital signature that is legally binding in the documents. Saves a lot of time and money from both sides. PDFfiller is best tool for pdf editing online. It includes plethora of functionalities for editing pdf. Some of the functionalities I like include add text, note, watermark, redact, draw, add images/videos, textbox, date, checkmark, search and replace text, spellchecker, undo and redo, copy and paste, and pdf toolbar, add branding and Document signing and many more feature. PDFfiller supports integration with major cloud platforms including Dropbox, Google Drive, One Drive and Box. One of the best and easy to use tool for filing and storing all sort of forms electronically. Allows you to convert pdf files into other formats such as Microsoft word, excel and ppt. 'Send to Sign' feature is a boon to corporates and legal industry. Some of the advanced feature require a great learning time from the end user. Sometime you would not get expected results while converting a Pdf to word in terms of change in formatting which is difficult to edit. Sometimes the tools is slow while working on large size files.
Ravinder B.
2019-09-18
I started the free trial, and my document has trouble being edited, so I hope this can be sorted. The help was quick and efficient and Kara escalated it when she knew there was a problem, so top marks there. I just hope the techie team can sort the font.
Amy
2023-10-29
SIMPLE AND EASY TO UNDERSTAND FOR PEOPLE WHO ARE NOT TECH SAVY ITS GOOD BUT PRICE SHOULD BE MADE RESONABLE SO THAT MORE PEOPLE CAN AFFORD AND USE YOUR TOOLS. FOR PEOPLE IN INDIA IT IS STILL EXPENSIVE. IF YOU REDUCE YOUR PRICE, IT WILL BE AFFORDABLE TO MANY AND YOU WILL HAVE MORE CUSTOMER VOLUME IN INDIA THAN ANY OTHER COUNTRY. THIS WILL HELP YOU GENERATE MORE REVENUE.
ALLTRONIX INC
2023-03-08
AS OF THIS DAY PDFFILLER IS THE ONLY PLATFORM THAT SEEMS TO DO IT ALL IN A VERY SIMPLE AND STRAIGHT FORWARD APROACH WITH A LAYOUT FOR THE FIND AND CLICK END USERS. I BY FAR SINCE FINDING THIS WEBSITE HAVE NEVER EVEN THOUGHT ABOUT GOING ELSE WHERE AND HAVE BEEN USING THIS APLICATION FOR SOME 5 YEARS NOW MAYBE EVEN LONGER. I BWOULD DIFFENETLY GIVE THIS RECOMMENDATION TO FRIENDS AND FAMILY AS WELL AS STRANGERS FOR THAT MATTER AND HAVE TOLD SERVERAL PEOPLE ABOUT PDFFILER OVER THE YEARS WHEN IN CONVERSATION AND THE NEED ARISES
Edward Thaddeus B
2022-08-16
Over the top excellent customer service First and foremost i want to express the excellent customer service i received from Daniel yesterday evening to the wee hours of this morning. i couldn't figure out how to correct or update a form and my computer literacy was no where to be found. I ask Daniel to please have patience with me and he went above and beyond my expectations. Daniel not only spent hours on trying to help me figure out the issue he also walked me through how to send him a screenshot of the issue! Not once did i ever feel rushed or uncomfortable especially when i wasn't able to follow his instructions. He not only walked me through fixing the form; he also helped me fill in some fields i was unable to do. The most awesome experience was he stayed on the line with me the entire time!!! This is the kind of customer service that is such a rare commodity and i was blessed enough to be on the receiving end with Daniel. He is absolutely an asset to this company and greatly appreciated.Warmest Regards;Rhonda Wright
Rhonda Wright
2021-05-19
Customer service is not so good Pdfiler is awesome editing tool and really helps in composing forms/papers. But their customer service seems absent.
Charlie H.
2021-01-19

Lock PDF and Add Watermark to PDF for Computer

Secure your important documents with our PDF Lock and Watermark feature. This tool helps you maintain control over your files while ensuring that they remain confidential and professional. Whether you are sharing contracts, reports, or creative work, this feature provides peace of mind.

Key Features

Easily lock PDF files with a password
Add custom watermarks to protect your content
User-friendly interface for quick access
Compatible with various PDF readers
Supports multiple file formats for conversion

Potential Use Cases and Benefits

Protect sensitive information in contracts and agreements
Secure intellectual property by adding watermarks
Share documents confidently without fear of unauthorized access
Enhance brand visibility with personalized watermarks
Organize files efficiently with password protection

This feature helps you tackle the problem of unauthorized access to your documents. By locking your PDF files and adding watermarks, you can share information securely while still promoting your brand. It gives you complete control over your content, ensuring that only authorized individuals can view or edit your files.

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
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.
Click “Add directories to list” icon to add all files in a folder to the list together; Click “Watermark→Create→New Text Watermark” to enter into “Add Text Watermark” interface, define name, then click “Macro” button to choose unique data for different PDF copies;
Step 1: Select your PDF document. Step 2: Add Text Watermark. Click the Add Text button at the top of the PDF page. Step 3: Change text size, rotation and location on page. Step 4: Change text color, transparency and font family.
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 Add Watermark to PDF for Computer - 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