Stay mobile Lock PDF Files on iPhone For Free

Drop document here to upload
Select from device
Up to 100 MB for PDF and up to 25 MB for DOC, DOCX, RTF, PPT, PPTX, JPEG, PNG, JFIF, XLS, XLSX or TXT
Note: Integration described on this webpage may temporarily not be available.
0
Forms filled
0
Forms signed
0
Forms sent

Discover the simplicity of processing PDFs online

Card illustration
Upload your document in seconds
Card illustration
Fill out, edit, or eSign your PDF hassle-free
Card illustration
Download, export, or share your edited file instantly
Top-rated PDF software recognized for its ease of use, powerful features, and impeccable support
Trust Seal
Trust Seal
Trust Seal
Trust Seal
Trust Seal
Trust Seal

Every PDF tool you need to get documents
done paper-free

Card illustration

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.
Card illustration

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.
Card illustration

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.
Card illustration

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.
Card illustration

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.
Card illustration

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:
I am only done with one of two multi paged forms.I was very thankful to be able to fill out some very long forms with a computer rather than free hand.
Diane F
2014-06-30
Am new to PDFfiller so here are some initial comments: 1. an "undo" button would be nice 2. when sharing a document and adding comments/instructions, it would be helpful to have the option to pull up the document to be shared for reference.
Anonymous Customer
2014-07-01
I found it really easy to use, but all of the boxes did not have specific instructions. I struggled with boxes 16-18. Through google, I discovered that I should leave them blank.
ruth c
2018-02-01
Adobe for Life Overall, it's an amazing feature of the Adobe family that comes in handy for myself and especially in my industry where contracts are signed and requested frequently. So you're working on a project, job, whatever and you get a form that needs to be filled out, signed, and returned. It's a PDF file which is great because nothing can be edited off the original form. You're only responsibility is to fill it out and send it back, but you don't have a printer available, there's no fax machine around, and this form needs to be completed ASAP. The PDF filler is an amazing tool that gets the job done. Not only does it allow you to fill in information on any PDF file, it also allows you to upload your signature to docs as well. So while you can add your information to any pdf file, some of the files don't always allow for ease of filling out. For example, some forms allow you to type into blank spaces where words and information are supposed to go, while others have distortion issues and don't always allow for certain spaces to be typed into.
Tomara J.
2019-03-10
Thank you, I am grateful!!! This is such an amazing site / application. I have recently relocated to Puerto Rico from Philadelphia and I cannot be more appreciative in how much of a difference it has made upon me stumbling across this site. ~Nani
Nani Love
2021-11-12
I'm very happy with the mid-priced… I'm very happy with the mid-priced version so far. (However, as Yogi Berra famously said, "It's a bit too early to tell the future.")LOL
Thomas
2021-03-15
I have never needed a pdf filler before… I have never needed a pdf filler before but this website has made everything super easy to understand and use.
Jennifer Frank
2020-10-10
I LOVE the features in the premium package! Now I can create a fillable form and put it on my website where it can be filled out directly! I can even customize the button they click on to fill out the form! I added radio buttons, check boxes, and fillable text boxes. I even saw where I can collect payment upon completion of a form. Great job PDFfiller.com for all these amazing business features! Brainmavens.com has become so much more user friendly thanks to you guys! -S.Farris
Shelby F
2024-12-29
I was able to find any form that I… I was able to find any form that I needed to fill out. PdFiller was instrumental in helping me fill out additional tax forms needed to file my taxes. All the forms were there already! There's even away to have your documents sent/mailed to the intended party! I wish there was a way I could have a subscription for a much lower amount that's based on my usage. Right now the price point is decent for a person that uses it frequently like multiple times a day.
Tiffany White-Smith
2025-07-01

Is it possible to Lock PDF Files on iPhone?

Have you ever been tired with carrying a laptop around everywhere you goonly to be able to open and send back that crucial document? Perhaps you have your clients backing off because you didn’t have the ability to Lock PDF Files on your iPhone? Here at pdfFiller, we offer you a solution that frees you from being dependent on a software with no cloud support, to be able to work from any device, anywhere.

pdfFiller is the leader in online document management, which doesn't mean it’s challenging to use. Lock PDF Files on iPhone and more:

01
Simplify collaboration. Highlight content or add comments for your colleagues
02
eSign documents. Create a legally-binding signature and send a form for signing in seconds
03
Add new objects. Insert texts, crosses, checkmarks, images, text boxes, or simply draw on a document
04
Convert files. Save your records as files in PDF, Word, Excel, or PowerPoint formats
05
Export content. Share samples via links, emails, messengers, or fax
06
Cover sensitive data. Use the Blackout option to hide delicate information that shouldn’t be spread to third parties
07
Request additional authentication. Ask recipients to confirm their identity by taking a photo or linking social media profiles

If you jump into the pdfFiller's functionality, you can explore even more helpful tools and make on-the-go document management flow considerably more effective and straightforward. Consider using it to avoid wasting your energy on carrying your laptop all the way around. Get everything you need for professionally dealing with PDFs. Register now!

Stay Mobile: Lock PDF Files on iPhone

With the Stay Mobile app, you can easily lock your PDF files on your iPhone, giving you peace of mind about your private information. This feature allows you to safeguard sensitive documents from unwanted access.

Key Features

Simple locking mechanism for PDF files
User-friendly interface
Secure encryption to protect documents
Quick access controls for managing files
Compatible with various PDF formats

Use Cases and Benefits

Keep personal documents like tax returns and medical records safe
Secure work-related PDFs to prevent data breaches
Protect confidential information shared via email
Easily organize and access locked files when needed

By locking your PDF files, you can effectively address concerns about data privacy. This feature not only protects your documents but also allows you to store important information without worry. Feel confident that your private files remain private with Stay Mobile.

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
How to set a password to protect PDFs on Android. Begin by navigating to the password protection page on your preferred browser. Click the Select A File button to choose and upload your PDF. Create a password and enter the password, then retype it to confirm.
Folder Lock lets you password-protect your personal files, photos, videos, documents, contacts, wallet cards, notes and audio recordings in your iPhone.
You can assign a password to a document so that only those who know the password can open the document. Passwords can consist of almost any combination of numerals, capital or lowercase letters, and special keyboard characters. A document can have only one password.
You can lock a PDF or image so that it can't be edited or deleted. If you own a locked document, you can edit the document after unlocking it. Others can change the document's contents only by creating a duplicate of the document and editing the duplicate.
Proceed as follows: Open Files and tap on Browse (bottom-right in the footer menu). Go for On My iPhone. ... Tap Downloads or any other available folder that stores the PDF that you want to protect. Tap on the document's thumbnail to open it. Use the Share icon. Select Lock PDF. Type a Password and verify it.
How to set a password to protect PDFs on Android. Begin by navigating to the password protection page on your preferred browser. Click the Select A File button to choose and upload your PDF. Create a password and enter the password, then retype it to confirm.
Lock a closed document: Select it, choose File > Get Info, then select Locked. Lock an open document: Hold the pointer to the right of the document title, click the down arrow , then select Locked.

Video instructions on how to Lock PDF Files on iPhone

#1 usability according to G2

Try the PDF solution that respects your time.
Trust Seal
Trust Seal
Trust Seal
Trust Seal
Trust Seal
Trust Seal