If you lost or forget a ZIP password and want to reuse it, you can use CrackPDF ZIP Unlocker (click here to download) to find the ZIP password back and unlock your ZIP file again. This decryption tool provides three ways to unlock zip files which are protected by forgotten passwords: the dictionary attack, the brute-force with mask attack, and the brute-force with mask attack (trying all possible combination).

The dictionary attack will try every keywords stored in the default dictionary provided by this program to unlock ZIP file. You can also add dictionary created by yourself to the program. If you don't remember any part of the password you can use this method.

The brute-force with mask attack can help you narrow down the searching area. If you can remember the key length, or one letter or number of the password, you can try this method.

The brute-force with mask attack (trying all possible combination) will try every possible combination if you can remember anything about the password.

The following is the essential part of the interface of CrackPDF ZIP Unlocker: the option setting pane.

As you can see, there are four tabs on this pane: Recovery, Brute-force, Dictionary and Option. The default tab control is the Recovery tab control, which contains three radio boxes. You can click the second or the third radio box to initiate the contents of the Brute-force tab control and the Dictionary tab control.

For example, if you remember the first letter of the password is p, you can do as follows to narrow down the searching area: Click the second radio box before Brute-force with Mask Attack, > click Brute-force to switch to the Brute-force tab control as illustrated below, > click the square box before A-Z under the title Character Set, > click the square box before Prefix and type p in the edit box following Prefix.