The ways to access the locked PDF file when you forget the password will be discussed in this article. There are two different types of passwords on PDF files. No matter what kind of password it is, we will offer a solution to help you unlock it effectively.
1. What's PDF Password Protection?
Adobe Acrobat has the feature password-protected encryption built directly into the format, which makes PDF file protection easy to do and difficult to be viewed or modified by anyone other than you using the file.
Password to Open a PDF File
This password is needed to open the file. It is called document open password. Security restrictions may apply. This password protection means disabling anyone's access to the PDF file and is used to stops anyone without access to the password from opening and viewing it.
Password to Restrict Editing and Printing
This password will not be needed when you open the file. It is called permissions password. You will be asked to enter the password when you want to edit or modify the PDF file. This password is used to protect the format of the file and stops anyone from editing, commenting and modifying your PDF file.
2. Passper for PDF Helps to Recover or Remove Your Lost Password
If you forget your PDF password, no matter it is document open password or permissions password, it is recommended that you use Passper for PDF to unlock the PDF file. It is a one-stop solution. Not only does it help in recovering passwords but also helps to enable printing/copying and editing any PDF files.
Why Choose Passper for PDF?
Full Compatibility: It also works on PDF document created by all versions of Adobe Acrobat and other PDF applications.
4 Attack Types: Passper analyzes the scenarios that people may encounter to design different recovery algorithm and methods to unlock encrypted PDF files, which makes it more possible to find your password back.
Fastest Recovery Speed: It has the fastest speed of checking password compared with other recovery tools. This guarantees the higher recovery rate of the password.
One Click to Remove Permissions Password: You can remove the password protection on editing your PDF files within seconds.
The above 4 points makes Passper for PDF the best PDF password recovery tool with the highest recovery rate in the market. Below is the guide on how to use this tool. Check it based on what password protection your PDF file has.
2.1. Recover Document Open Password for PDF Files
Download and install the software on your computer and open this password recovery tool on your mac/computer.
Step 1 Choose Recover Passwords on the Home screen.
Step 2 Add the PDF file that you want to unlock. Select one of the 4 password attack types offered. Passper offers a short description of each attack type. Choose the attack type that is best for your situation.
Dictionary Attack: It searches your password from a password list. You can use the default dictionary file or import one.
Combination Attack: Combine only the characters you choose randomly to find your password. Your password will be found from the combinations of these characters.
Mask Attack: Asks for some details of your password, such as length or range and then finds the original password using those clues faster. It requires that you offer some part of the password and combine this part with all possible characters.
Brute Force Attack: Refers to the attack type where you cannot provide any clues to your password, it then does a thorough search and gets the original password.
Step 3 Click on the Recover button, then the program will immediately start the recovery. Once the tool has finished recovering your document open password, it will appear on the screen and be ready for you to note it down and access the file.
2.2. Remove Permissions Password from PDF
Step 1 Open Passper for PDF and choose Remove Restrictions on the Home screen.
Step 2 Click on the "+" icon to add the locked PDF file and click Remove.
Step 3 Just one second is needed, your encrypted file will be password free. You can check it in the desk folder.
3. Tips for PDF Files Not Opening
If you're facing troubles with opening your PDF files. Read this part to get the problem solved. There are many reasons that could be causing the problem, for example, Adobe Acrobat or Adobe Reader is an old version, PDF files were not created using Adobe programs, PDF files are damaged, PDF files has corrupted data, etc. All of these can be causing issues with Adobe to open your files.
4 Tips for You When PDF Files Are Not Opening
If you are facing this issue, there are several things you could do to solve it.
Method 1: Check Adobe Reader settings.
Open Adobe Reader.
Click Edit on the top menu.
Search for Preferences and click on it.
Find and press Security (enhanced) on the pop-up window.
Check the Sandbox Protection options and uncheck the box of Protected mode.
Click Yes to confirm the changes.
Method 2: Checking for errors/damages in PDF file.
It is possible that the PDF file has been damaged when sent to you. It happens to some people that the file gets corrupted after being transferred from a flash drive or website. It is recommend that you ask the person who sent the file to you to send it again through other ways.
Method 3: Checking and solving any issues of Adobe Reader or Acrobat.
There might be some problem with the Adobe Reader or Acrobat itself. Launch the program and click Help on the top. Choose Repair Installation from the drop down list. Click Yes to start repairing current Adobe Reader/Acrobat installation.
Method 4: Update Adobe Reader or Acrobat.
Open Adobe Reader/Acrobat.
Click Help and choose Check for Updates.
An pop-up will show up and the program will check possible updates on your software.
If update is available, click on Download and Install to get the latest update.
Restart your computer after the update is finished.