Dr.Fone User Guide for DocPassRemover

Part 1: What Is a PDF Document Open Password?

A PDF open password, also known as a user password, restricts access to the content of a PDF file. Without this password, you cannot open or view the file at all. This is different from a PDF permissions password (owner password), which only restricts actions like editing, copying, or printing.

Part 2: Method 1. AI-boosted Decryption (Fast & Intelligent)

By entering the known permission password, the AI engine examines the encryption structure and metadata of the PDF file to intelligently detect and reconstruct the open password, or directly remove it to grant full access.

Begin by opening the Dr.Fone – DocPassRemover application. Make sure your software is up to date to access the latest AI-powered features.

Click the “Import” button to browse and select the PDF file you want to unlock. The system supports standard encrypted PDF formats without size limits.

In the mode selection screen, choose "I know the permission password but not the open password"—this tells the system to prepare AI analysis based on the known permission password.

Choose the AI-boosted Decryption method from the list of unlocking options. This will activate the intelligent analysis engine for password recovery.

Type in the correct permission password you already know. The system will use this input to begin an AI-powered decryption of the open password.

Once the open password is found, you’ll be given two options—copy the recovered password for future use or directly remove the password to make the file permanently accessible.

Part 2: Method 2. Brute Force Decryption (For Strong/Unknown Passwords)

If you have forgotten the open password for your PDF file, the Brute Force Decryption mode is the solution. This mode uses a combination technique to try all possible password combinations, ensuring that even without any clues, the file can be unlocked successfully.

Key Features:

• Ultra-Fast Engine: Industry-leading speed of 680,000 password attempts per second.
• Full Range Cracking: Automatically tries all combinations from 3 to 16 digits.
• Advanced Encryption Compatibility Supports 128-bit AES, 128-bit RC4, and 256-bit AES encryption.

Step 1Choose the Option

By selecting this option "I don't know anything about the password", you indicate that you have no memory of the password. The system will initiate the brute-force mode under this assumption. Click Next to proceed to the next step.

Step 2Select the decryption mode, then click Next

On the decryption mode selection screen, choose the Brute Force Decryption option. This activates the brute-force decryption technique, where the system will try all possible password combinations until the correct one is found.

Step 3Monitor the decryption process in real-time

It will show you the process, and you can monitor the decryption progress as the system works to find the correct password. Depending on the complexity of the password, this may take varying amounts of time.

Step 4Decryt Open Password Successfully

Once the open password is found, you’ll be given two options—copy the recovered password for future use or directly remove the password to make the file permanently accessible.

Note: Brute Force decryption time varies based on password complexity — please be patient during the process.

Part 4: Method 3. Combined Decryption (Hybrid Mode)

If you can remember part of the password information—such as its length, characters used, or specific fragments—the Combines Decryption mode is your best choice. This method leverages partial clues to generate targeted combinations, improving speed and success rate.

Key Features:

• Success Rate Boost: The more accurate password info you provide, the higher the unlock rate.
• Full Encryption Format Support: Compatible with 128-bit AES, 128-bit RC4, and 256-bit AES.

Step 1Choose the Option

Select this option "I know some information about the password", if you have some knowledge about the password structure. Even small hints like character type or length can significantly reduce the decryption time.

Step 2Select the decryption mode, then click "Next"

Choose Combines Decryption from the list of decryption modes. This will enable a smart algorithm that uses your input to build and test likely password combinations.

Step 3Provide the password hints you remember.

Enter any details you recall—such as estimated password length, whether it includes numbers, symbols, or known fragments. These clues help narrow the cracking scope.

💡 Tips to Improve Unlocking Success & Speed

• Fill in password info you're sure about.
• For uncertain parts, select "I don’t know" or choose a broader range.
• If it fails, click "Retry" to adjust your inputs.
• If unsure of any password info, switch to Brute Force mode for better results.

Enter the prefix or suffix of your password.

Enter the possible combinations in the password.

Select the set of symbols that may be used in the password.

Check all the detailed information and then click "Next"

Step 4Monitor the decryption process in real-time

Watch as the system attempts various combinations based on your inputs.

Step 5Decryt Open Password Successfully

Once the correct password is found, it will be displayed on-screen. You can either copy it for future use or click remove password to unlock the document permanently.

WHAT YOU'LL NEED

Solution center on YouTube

Dr.Fone provides a complete set of tools for solving all iOS/Android phone problems.

Watch more

Need help?
You might find the answer to your question in the FAQ or additional information below:

• · I Forgot PDF Password: How To Open Locked PDF File Free.
• · Break File Locks Smartly With EMCOUnlock It 6 And Take Back Control.
• · Reveal Hidden PDF Content with SmallPDF Unlock PDF
• · How to Convert Password Password-protected PDF to Normal PDF
• · Smartest Adobe Password Remover That Saves Your Day