How to Add Password to Protect Your PDF File

Last updated on May 21, 2019 by JoKelly

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How to Add Password to Protect Your PDF File

With the ease of sharing and transferring PDF files online also comes the threat of security. Incidents of PDF files being accessed by the wrong people and essential information was stolen are happening everywhere. That is why more people are already locking their PDF files to gain more control over who can access or alter their documents. So, if you want to keep your business email attachments confidential, especially with business contracts, you should learn how to password protect a PDF.

Acethinker PDF Converter

Acethinker PDF Converter is, without a doubt, one of the best tools out there for converting PDF files to editable formats like Word, Excel, PowerPoint, and HTML. However, this all-in-one PDF converter also allows you to protect your PDF files with a password. You also have the option to set permissions for specific functions like add, copy, delete or print, which is an excellent way of limiting the actions that other people can do to your PDF document. Here’s how to password protect PDF using Acethinker:

Step1 Download and install the app

To download the app, click the “Download” button below. After downloading the software, run the program and load the PDF file that you want to protect by going to “File”, “Open”, and choose the right PDF file or just drag the PDF file to Acethinker’s main interface.

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Step2 Add a password

From there, you can already edit your PDF file or in this case, add password protection. At the upper right corner of the screen, go to Edit Tool, “Other Tools”, “Protect PDF”. Then, “choose a file” to protect and it will let you add a password to your chosen PDF.

Other tools protect tab

Step3 Input a password

After setting your password, click “OK” to save your given password, and you’re good to go

add a password

With your PDF file now protected, you can already guarantee that anyone who wants to open your data will be required to enter the password. Just make sure to take note of your passwords and keep them safe because Acethinker doesn’t offer an option to recover your password if you forgot them.

Adobe Acrobat Pro

Another smart tool that lets you add password encryption to your PDF file in Adobe Acrobat Pro. Another smart tool that lets you add password encryption to your PDF files is Adobe Reader. Aside from locking your file, you can also restrict features like editing and printing. Moreover, while you cannot prevent others from saving a copy of your PDF file, every copy created will have the same restrictions as the original PDF file. With Adobe Reader, you can choose from two types of passwords. The User Password or Open Password will require the user to type a password to gain access to your PDF file. The Master Password or Permissions Password, on the other hand, will need the user to type a password to change the restrictions on a PDF file. It is why most people choose to protect their PDF files with both passwords for added security. So, how to password protect a PDF in Adobe Reader? Here are some steps for you to follow:

Step1 Go to Tools

Open the PDF and go to “Tools”, “Protect”, “Encrypt”, “Encrypt with Password”. After receiving the prompt, simply click “Yes” to change the security.

Go to Tools

Step2 Choose require a password to open the document

Choose “Require a Password to Open the Document” then type your desired password on the field. You will be notified if your password is strong enough or if you need to type another one.

Choose require a password to open the document

Step3 Select what Acrobat version you use

From the Compatibility dropdown menu, choose the “Acrobat Version” that you have. Make sure that you select a version that’s equal to or lower than your recipient’s version of Reader or Acrobat.

Select what Acrobat version you use

Step4 Encrypt all documents

Choose an encryption option. “Encrypt All Document” Contents lets you protect both the document and its metadata. This means that search engines won’t be able to index your PDF file. Encrypt All Document Contents except Metadata, on the other hand, allows you to encrypt the contents of the document except metadata, which will be indexed by search engines. Finally, Encrypt Only File Attachments will require the user to type a password to open file attachments.

Encrypt all documents

Step5 Confirm your password

Confirm your password by retyping it and click “OK”.

Confirm your password

This means that recipients can open the PDF file in Adobe Reader or Acrobat without requiring a password but will need one if they edit or print your document. You also have the option to use both types of passwords, and they can be opened with either password you set. However, only the master password will allow the recipient to change restricted features.


Now that you know how to add a password to PDF, you can already enjoy the benefits of protecting your PDF files. Locking a PDF file helps you protect your document from copyright infringement and also secures the integrity of your document. This is especially important if you’re running a business where contracts, agreements, and other crucial documents are being exchanged within and outside your office. By locking your PDF files, you’ll have more peace of mind knowing that you are in control of who accesses your PDF documents and what changes they can make to them.

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February 10, 2019

Post By JoKelly to PDF Converter Pro

Last updated on May 21, 2019

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