Last updated on
Dec 12, 2023
Lock PDF and Merge PDF for Mobile 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
Upload your document in seconds
Fill out, edit, or eSign your PDF hassle-free
Download, export, or share your edited file instantly
Top-rated PDF software recognized for its ease of use, powerful features, and impeccable support
Every PDF tool you need to get documents done paper-free
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.
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.
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.
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.
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.
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:
Performance is slow and choppy at times. There is no OBVIOUS way to turn off the popups every single time I go to fill out a form. Transitioning from one form to another is extremely disjointed. There is no clear way to fill out one form and simply move on to the next in a series. If there is a clean workflow in there somewhere, it's not obvious, at least, not for my use case, which is to fill out a form for each of my employees from a remote location, download all and print all for distribution. Seems like every time I finish something, it takes a while to save, and a while to get to the page letting me choose what to do next, which is always to display the file list again, and a while to load the file list. . .rather than simply keeping the filelist persistent and hidden, as would seem same here. Also, this form, won't let me enter more than a character or 2 before kicking me out. I am writing this feedback in a notepad and then copying it in all at once. Awesome.
2017-02-17
Does exactly what I needed it to do. Allows me to sign a document while leaving the date field open to change, allowing some flexibility in working on the document.
2018-05-22
Great program! Love it! Totally worth every penny paid for subscription. This should be a must-have in any business that handle a lot of documents. Thank you.
2019-04-25
I like how the PDF filler has been easy to work with but I think there should be a separate cost for those of us not using the filler all the time. Its expensive at the moment for me.
2019-07-05
I liked the clear simple explanations.and the fact that it stops you from clicking on anything until it has explained the basic functions of the key attributes. For some of us who think they can probably figure it out on our own the little speed bump and wake up call save a LOT of time.
2023-03-31
I've been using PDFfiller regularly for over 2 years now, and it works wonderfully. I'm able to upload documents, add fillable lines, and get electronic signatures seamlessly. Customer service is also great - prompt and friendly in attending to any questions or issues. Makes running my business that much easier.
2022-05-05
I really appreciate how streamlined and…
I really appreciate how streamlined and easy it is to fill out tax docs! Makes it so much more hassle free. My only issue is that it's a 100% free service, as I wish this was something the IRS did a long time ago.
2022-01-11
Though it is new to me
Though it is new to me, and signed up today, it will take sometime to know how good I am feeling about it. So far, I am satisfied Thanks
2021-02-19
This has been a lifesaver for me
This has been a lifesaver for me. I have several contracts with jobs that I am doing. To be able to fill out contracts, questionnaires, job interview questions and send project proposals has been amazing. THANK YOU FOR THIS APP!
2020-06-03
Lock PDF and Merge PDF for Mobile
Protect your documents and combine files easily with the Lock PDF and Merge PDF feature for mobile. This tool offers a simple solution for managing your PDF files securely and efficiently.
Key Features
Password protection for your PDF documents
Merge multiple PDF files into one seamless document
User-friendly interface for quick access
High compatibility with various mobile devices
Automatic backup options for document safety
Potential Use Cases and Benefits
Secure sensitive information for work or personal use
Combine multiple reports or documents for easy sharing
Protect important contracts or agreements
Organize travel itineraries or plans in one PDF
Facilitate collaboration by merging contributions from multiple users
This feature addresses your need for document security and organization. By locking your PDFs, you eliminate the risk of unauthorized access. Merging files provides convenience, keeping your important papers in one place. Save time and effort with Lock PDF and Merge PDF for mobile.
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 on my phone?
Start by downloading the app from Google Play. Next, open it > password protection > import the PDF from your device memory. If you don't see any directory, clear the app data and try again. Now, you'll see two password option owner password and user passwords.
How do I merge PDF files that are locked?
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.
How do I combine secured PDFs without password?
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.
How do you combine PDF files on iPhone?
Run the PDF editor app on iPhone. Tap on the Edit icon in the top right corner of the PDF editor app on iPhone, then select the PDF files you want to combine, finally tap the Merge button at the screen bottom to merge the selected PDF files together into one PDF file on your iOS device.
How do I lock a PDF from copying?
Open your PDF.
Go to Protect Tab.
Click Password.
Enter Password.
Select the Printing allowed dropdown.
Select None means to prevent printing.
Select the Changes Allowed dropdown.
Select None -means the highest level of protection.
How do you combine PDF files on Android?
Select a file in the PDF Viewer file browser by long pressing on the cover image of the PDF. This will start the multi-file selection mode.
Select additional files for merging by tapping them.
Once you're done selecting files, press the merge icon in the multi-file selection bar at the bottom.
How do I combine PDF files on my phone?
Select a file in the PDF Viewer file browser by long pressing on the cover image of the PDF. This will start the multi-file selection mode.
Select additional files for merging by tapping them.
Once you're done selecting files, press the merge icon in the multi-file selection bar at the bottom.
How to Lock PDF and Merge PDF for Mobile - video instructions
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