GuaPDF, sometimes referred to as Guaranteed PDF Decrypter, is a combination PDF password remover/recovery tool. GuaPDF is easy to use and doesn’t even require installation.
Method: GuaPDF is primarily a PDF password remover tool for the owner password but can also be used as a PDF password recovery tool for 40-bit encrypted user passwords.
Limits: GuaPDF works with PDF files up to version 1.7 level 3 even with 256-bit AES encryption. However, GuaPDF will only decrypt PDF files at higher levels of version 1.7 if the encryption is at 128-bit AES.
PDF Password Remover is another installable PDF password remover. It has a very simple PDF-in / PDF-out interface.
Method: PDF Password Remover’s name says it all — it’s a PDF password remover tool for the PDF owner password, and that’s all it does.
Limits: PDF Password Remover works with PDF files up to version 1.7 level 8 with 128-bit RC4 encryption.
My Test: PDF Password Remover instantly cracked a version 1.7 level 8 PDF encrypted at 128-bit RC4.
PDF Password Remover is really easy to use but doesn’t support some of the higher encryption levels. This might be the perfect PDF password cracker/remover tool for some PDF files but you’ll want to make another choice if the encryption level demands it.
PDF Unlocker is a Windows installable program that will find the owner password of a PDF file. PDF Unlocker works much like PDFCrack but is instead a native Windows application, making it a bit easier to use, though noticeably slower.
Method: PDF Unlocker sounds like it might be a PDF password remover tool but in reality it’s a PDF password recovery program since it discovers the actual owner password from an encrypted PDF. PDF Unlocker can use either a brute-force or a dictionary password recovery method.
This Tool is very intuitive and allows you to unlock a PDF without a key in seconds.
You only have to upload the document to the web and check the box for editing the file permissions. You can then download the file to your desktop, upload to Drive or DropBox.
Online2pdf not only allows you to remove password of a PDF but you can also edit, merge or export the contents.
Of course, each individual file can not be larger than 50 MB and all documents should not weigh more than 100 MB. At most, you can select 20 PDFs.