How to Unlock PDF Online - Top 5 Online PDF Unlocker Reviews

A locked PDF can be incredibly frustrating to deal with, and unlocking it without a clue can also be equally annoying. Even if you search for methods to crack unknown password from PDF on the Internet, you will be trapped in various methods and tools. Some methods that do not work can only waste your precious time. In this article, we have listed the top 5 online PDF unlocker reviews for you on how to unlock PDF online, any one of them can easily let you do this.

1. Unlock a Known PDF Password on

How to unlock PDF online? LightPDF is a fantastic online website that allows you to crack the secured PDF by removing passwords. They also have a few desktop applications such as a PDF editor and converter, because of this, they have successfully processed millions of documents. Before it works for you, please prepare your PDF password. And if the PDF document is too large or the password is too strong, then the PDF password cracking process will be very complicated.

Step 1. On the main screen, please select the "Unlock PDF" option.

Step 2. After that, you need to upload the desired PDF by clicking on the "Choose file" button.

Upload PDF file


Step 3. After it's done, the process will start automatically. For this, you need to enter the password for the password protected PDF.

Enter PDF password


Step 4. Once the password is removed successfully, just press on "Download" for getting it.

download pdf


Pros: Cons:
  1. ● Free and easy process.
  2. ● Quickly remove password from PDF.
  3. ● Compatible with PC and mobile.
● The PDF Open password must be known.
● The PDF document is larger than 5MB, you'll have to get a VIP membership.


2. How to Unlock PDF Online on

PDFCandy is one of the most popular online tools for removing PDF passwords. It also comes with a plethora of other features such as crop PDF, edit PDF, protects PDF, and merge PDF, etc. And it gets the job done in a matter of seconds. But this online PDF unlocker can only break encrypted PDF only if you know the password.

Step 1. Browse on your computer and click on the "Unlock PDF" option.

Step 2. Next, click the "+Add file(s)" button to upload the locked PDF files. By the way, you can also do that through Dropbox, Google Drive, and drag & drop.

Import PDF file


Step 3. After your file has been uploaded, you need to hit the "Unlock PDF" button. then enter your password to open the PDF file. In a matter of seconds, the protection will be removed.

Step 4. You can now download your new PDF file.

download PDF file


Pros: Cons:
  1. ● Free to use.
  2. ● No need to download anything.
● Not 100% work on all files.
● The PDF is too large to be cracked easily.
● Only crack the PDF permission password.


3. Easily Unlock PDF Online if Known Password

Do you know You are allowed to break the restrictions by removing the known PDF password on this service website. Not just that, they have various other functions that are practical and easy to use. The best thing about smallPDF is that you don't need to download anything; everything is executed online, ensuring a seamless experience. Let's see how it works.

Step 1. Firstly, open the "Unlock PDF" feature on the main screen.

Step 2. On the next screen, please choose the PDF file that you want to unlock, just by clicking on the "Choose file" option, or you can simply drag and drop your document.

upload PDF file


Step 3. After that, click on the "Unlock PDF!" button. Next, you will be asked to enter the PDF password if you have, and then click the "Readlly Unlock" button on the right, the process will start. Generally speaking, PDF will be cracked in a matter of seconds. Next, you have the right to edit and remove the protection of this PDF.

Unlock PDF file


Step 4. In the last window, you can download the documents. You will also see various tools in case you want to carry out other functions.

Download PDF file


Pros: Cons:
  1. ● All Free.
  2. ● It is a versatile online PDF service website.
● The PDF password must be known.
● This site might not be helpful if the password is very long or strong.


4. How to Unlock PDF Online for Free was recommended to everyone at the end of the article. Which allows users to edit, transform, merge, split, compress and remove passwords from PDF files. As you can see, after opening a password protected PDF, all restrictions will be lifted by it. They're 100% free to use, but you'll face limitations if your file is large, in addition, you will be asked for the PDF password when the process begins.

Step 1. Go to their official website and find the "Unlock PDF" feature on the main page. Click on it.

Step 2. On the next screen, upload your locked PDF file by clicking on the "Select PDF files" button.

Step 3. After you've uploaded the PDF file, please click on the "Unlock PDF" button on the next screen. The process will ask you for a password, then press the "Send" button.

enter pdf password


Step 4. Next, the PDF password will be removed automatically, then click on "Download unlocked PDFs" to download your PDF.

download your pdf


Pros: Cons:
  1. ● Easy to use program.
  2. ● Unlock and remove PDF passwords quickly.
● Not working for unknown PDF passwords.
● It can be time-consuming if the PDF is too large.


5. Failed to Unlock PDF Online, Try iSeePassword Dr.PDF

Different from other methods of unlocking PDF listed in the article, iSeePassword is a password recovery software that needs to be downloaded and installed on the computer. And this PDF unlocker can help you break virtually any PDF password and recover forgotten passwords for PDF. What makes it so remarkable is that the password cracking speed is dozens of times faster than other software and the tool has the highest success rate we've come across. Regardless of how long or powerful the password is, iSeePassword Dr. PDF can work wonders. Learn how to use it to break a secured PDF password here:


Step 1. First, you need to download the software from its official website and install it on your PC.

Step 2. Click on the "remove owner password from PDF" option on the main interface. After that, you have to upload the PDF file. Just click the "Add File" button to do that.

add the pdf file


Step 3. In the next window, you'll have to choose the attack type. We recommend Brute-Force with Mask attack first. Because it can quickly crack and recover unknown passwords based on the information you provide, for this, you have to click the "Settings" button located on the right.

brute force with mask attack settings


Step 4. Once you're done, click on the "Start" button. This process will start immediately. In a few seconds, the PDF password will be restored and will be displayed on the interface. Finally, you can open the PDF directly with it, and it'll be saved in your chosen folder.

recover pdf password


Pros: Cons:
  1. ● Suitable for beginners.
  2. ● 100% work on PC and Mac.
  3. ● Effectively unlock PDF password without password.
  4. ● It can recover PDF file passwords in batches.
● Not free.
● It can only recover 3-character passwords for free.



On how to unlock PDF online, this article also explains everything. All the online PDF unlockers listed are also fantastic for breaking PDF documents and offer numerous other features if you want. But the only bad thing is that they can only remove the password from the PDF instead of cracking the unknown password. If you want to unlock your PDF without a password, give iSeePassword Dr.PDF a try.

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