The best program to unblock PDF.

AppNimi PDF Unlocker

Appnimi PDF Unlocker is without a doubt one of the best programs to unlock PDF available for Windows. Despite being completely free, it has nothing to envy commercial solutions and allows you to discover the password for open files Protected PDF based on two different techniques: the only one brute force which tests all possible password combinations and which dictionary trying to find the correct password based on a dictionary of words. It is compatible with all types of PDF and allows the user to set the minimum and maximum number of letters that make up the password to guess. Download from here.

Free PDF Unlocker

As the name suggests quite easily, Free PDF Unlocker is a program to unlock PDF free allowing you remove protections against copying and printing from PDF files with a simple drag and drop. After downloading and installing the software, this creates an icon in the desk called PDF Unlocker, Release PDF files here! and by dragging the files to be unlocked in the latter, the documents are automatically decrypted. Unfortunately it only works in OS 32-bit. Download from here.

GuaPDF

GuaPDF It is a very simple application to use that allows you unlock PDF removing from the latter the protections against copying and printing and, to a more limited degree, the request to enter a password for viewing (40-bit keys only). It supports all the latest encryption standards, allowing you to unlock documents protected with AES and RC4 techniques of 256 and 128 bits, and it is very fast in the performance of your work. The software is free, but it is available in a free trial (demo) version that lets you take advantage of all the features with small files. Download from here.

PDF Password Remover

PDF password removal tool is a free, simple but extremely effective program that allows you unlock PDF protected against printing or modification. This means that you cannot remove the user password required to open documents, but you can safely unlock files that originally failed. print, it does not allow the selection or copy of the text and it does not allow to compile form fields. It is compatible with all versions of Windows and is very fast. Download from here.

PDFUnlock

PDFUnlock! It is one of the most popular web application to remove protections from PDF files. Like many other similar solutions, both desktop and online, it does not allow removing the user password required to open documents, but only protections against printing and edition of PDF files. To use it, just connect to your main page, click the button Surf / Choose file, select the document to be unlocked and download the final result, that is, the original PDF without the editing and printing restrictions. It works with all browsers without the need for additional software. Download from here.

CrackMyPDF

CrackMyPDF is another one online service to unlock PDF Very effective and fast, which eliminates protections against printing and changes of the PDF documents. It does not involve removing DRM or user passwords that are required to view files. To use it, just connect to your main page, click the button Surf / Choose file and select the PDF to unlock. The entire procedure is done in a few seconds and without the need for any additional software. Download from here.