Lock PDF and Merge PDF on Mobile
01. Upload a document from your computer or cloud storage.
02. Add text, images, drawings, shapes, and more.
03. Sign your document online in a few clicks.
04. Send, export, fax, download, or print out your document.
Discover how to easily lock PDF and merge PDF on mobile and make the most of your documents
Create secure and intuitive eSignature workflows on any device, track the status of documents right in your account, build online fillable forms – all within a single solution.

How you can Lock PDF and Merge PDF on Mobile
Are you feeling hard-pressed to find a trustworthy solution for all your paperwork management needs, including the option to Lock PDF and Merge PDF on Mobile? airSlate SignNow is here to make your document editing and completion experience as frictionless as possible, no matter the difficulty. Our platform offers a versatile choice of business-ready paperwork editing, endorsing and collaboration and organization options you’ll find user-friendly enough to accommodate first-timers and pro users.
- Visit the airSlate SignNow main page.
- Register or sign in to your existing account.
- Select one of the ways to add your document.
- Open your document in the editor.
- Try out the left and top toolbar and find the ability to Lock PDF and Merge PDF on Mobile.
- Apply other features to improve or organize your paperwork.
- Save the modifications and download the document.
No matter what tool you leverage or the activity you perform, airSlate SignNow always makes sure that your work is protected and stress-free. Sign up for airSlate SignNow now and get an integrated solution that fits into any workflow!
How it works
Open your document in our editor.
Edit, modify, sign, and send your document out for completion.
Save and store your file securely.
eSignatures and beyond — simplify document workflows with advanced airSlate SignNow features
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Best ROI. Our customers achieve an average 7x ROI within the first six months.
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Scales with your use cases. From SMBs to mid-market, airSlate SignNow delivers results for businesses of all sizes.
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Intuitive UI and API. Sign and send documents from your apps in minutes.
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FAQs
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How to combine PDF files that are locked?
Use Adobe Acrobat to Merge Protected Files (password for files required) File -> Create for creating a new PDF file. Choose “Combine Files Into a Single PDF” option. Select Add File, add all the PDF files you want to merge. Add password of the locked PDF files. Select Combine. File -> Save As to save the PDF file. -
How to merge PDF files in mobile?
Combining PDFs on your Android device. Tap “Select files.” Your files will display and from there you can select which you'd like to merge. ... To reorder, select a file, and once it's highlighted blue, drag it to the desired position. When you're ready to combine your files, tap the “Merge” button. -
Can you lock a PDF on an iPhone?
You don't need any special apps or software to encrypt a PDF — you just need to add password protection, and you can do it quickly using an iPhone. -
How do you prevent a PDF from being edited?
Open a file in Acrobat and choose “Tools” > “Protect.” Select whether you want to restrict editing with a password or encrypt the file with a certificate or password. Set password or security method as desired. Click “OK” and then click “Save.”
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How do I make a PDF lockable?
Method 1: Use Adobe Acrobat Pro DC to Add Password Protection Open the PDF in Adobe Acrobat Reader. Click on “File” and select “Protect Using Password.” Choose whether you want to restrict editing and printing or just restrict opening the document. Enter a password, and confirm it. Save the document. -
How can I lock PDF file?
How to add passwords and permissions to PDF files: Open a file in Acrobat and choose “Tools” > “Protect.” Select whether you want to restrict editing with a password or encrypt the file with a certificate or password. Set password or security method as desired. -
Can you put a password on a PDF?
Open the PDF document you would like to password protect, select the Tools tab, scroll down to find the Protect & Standardize section, select Protect. 2. The Protect tool bar will appear, select the Encrypt button drop menu. Here you can either Encrypt with a Certificate or Encrypt with a Password. -
How to lock a PDF in mobile?
How to set a password to protect PDFs on Android. Navigate to the password protection page in your preferred browser using your Android device. Click the button labeled “Select a file” to choose and upload your PDF from your Android. Create and enter a strong password, then retype it to confirm.
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