Lock PDF and Encrypt PDF for Mobile Gratis

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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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Laatst bijgewerkt op 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:
Hard to find the erase button. But after I asked, I found it buried in the "tools" --seems like it should be more visible. Love the tool's simplicity otherwise.
Thom D
2015-07-15
Generally very good. When you print it saves first which I don't want it to do and "Save As" does not allow you to rename which is not right. Other than that, it does what you want.
Bill M
2015-12-15
kind of difficult to understand..sometimes it would not fill out the form and sometimes it would, then go back to the first signature and had to keep confirming.
RR
2017-01-17
I found PDF filler to be very helpful, however there was a bit of confusion with the cost of the account account. I I thought that I would be getting charged $6 dollars per month however my bank account was charged $72 dollars for an entire years subscription. I do not fill out enough documents to make a years subscription worthwhile. If that is the case, I think the website should give you the option of a 30 day trial period, and then give you the option of committing to a 1 year subscription. Otherwise, be more clear that you all are charging the entire $72 as oppose to the $6 per month. I have since canceled my subscription and I do not intend to use the website any longer. I would definitely like a refund effective immediately.
Amelia D
2017-03-13
I felt very mislead, I entered a lot of info onto a form and was only told when I tried to print there was a charge. There was a monthly charge shown but when I selected the monthly option the cost suddenly shot up
Anonymous Customer
2017-04-08
I like it but only need to fill in a few forms a year so it's not cost efficient for me. I would pay if the pricing were different. Instead I'll just unsubscribe.
Randy B
2019-02-07
The one time I used helped they… The one time I used helped they actually helped. The other service I tried to use before this one, I couldn't get any help.
Craig Matzke
2024-04-16
The PDF filler application and the great tool list The PDF filler application and the service from customer service and billing were all really good. The application is very helpful in this format for small business needs. Would recommend.
Virginia ONeal
2021-01-22
This app is not flooded with ads and/or private tools as far as I could check I just needed to merge stuff and this website (didn't know it, it just popped after a simple search) showed me tutorials for all the tools they have to make my documents complete and personalized as needed. I am here because we live in an era where an app that does not flood you with advertisement and charge your for each tool available calling some of them 'premium' or 'plus' or 'pro max' is RARE. I want to be explicitly thankful about this. Useful for the purpose of being useful. Didn't believe stuff like this existed anymore.
Bruna
2025-04-11

Lock PDF and Encrypt PDF for Mobile

Protect your documents with our Lock PDF and Encrypt PDF feature designed specifically for mobile devices. This tool offers a secure way to safeguard your sensitive information while maintaining accessibility.

Key Features

Securely lock PDF files with passwords
Encrypt PDFs to prevent unauthorized access
User-friendly interface for easy navigation
Compatible with all mobile devices
Quick and efficient encryption process

Use Cases and Benefits

Protect personal documents, such as tax forms or contracts from prying eyes
Secure business files with client information to maintain confidentiality
Safeguard sensitive information when sharing files over email or cloud services
Ensure compliance with data protection regulations
Simplify document sharing without sacrificing security

By using Lock PDF and Encrypt PDF for Mobile, you gain peace of mind knowing your valuable information remains safe. This feature addresses concerns about privacy and security in an increasingly digital world. You can confidently store and share your documents, knowing they are protected from 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
Open the PDF and choose Tools > Protect > Encrypt > Encrypt with Password. If you receive a prompt, click Yes to change the security. Select Require a Password to Open the Document, then type the password in the corresponding field.
Choose Tools > Protect > More Options > Encrypt with Password. Choose File > Protect Using Password, and then choose Advanced Password Protection from More Options.
1Choose a PDF for. Password protection. 2 Select a password. Write out or encrypt your PDF file: choose the password you wish to use to protect your file. 3 View and downloads.
File Locker To lock a file, you will have to simply browse it and long tap on it. This will open a popup menu from which you will have to select the option Lock. You can even batch select files and lock them simultaneously. After you select the lock file option the app will ask for a password to encrypt your files.

How to Lock PDF and Encrypt PDF for Mobile - 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