Guaranteed PDF Decrypter 4.0

• PDF restrictions are insecure and permissions password could be removed instantly.
• If PDF file with open password is old enough and uses 40-bit keys (Acrobat 3 compatible encryption), this password could be removed with guarantee.
• Searching for open password with 128 or 256-bit PDF encryption is only possible using PDF password recovery software.

• remove restrictions (unlock) of any secure PDF document (you should have the right to unlock the PDF document, for example, if you forgot the password). Any Acrobat version up to Acrobat DC is supported, even with 256-bit AES or 128-bit RC4 encryption. PDF restrictions removal is an instant process. Unlocked file can be opened in any PDF viewer without any restrictions so you may edit, copy or print it.

• remove PDF open password (a.k.a. user password). Decryption of the file with password for opening is guaranteed for old PDF documents with 40-bit key only. This process takes 1-2 days on one modern desktop computer and could be accelerated on GPU.
  

• Guarantee of removing restrictions regardless of password and encryption type used
• Newest PDF 1.7 and 2.0 (Acrobat X, XI, DC) files support, including AES encryption, Unicode passwords, compressed files and unencrypted metadata
• Removal of some restrictions in signed or certified files by digital signatures and in PDF forms
• Very high speed when searching for 40-bit key on modern multi-core Intel Core and AMD architecture and, especially, on modern NVIDIA and AMD cards with GPU acceleration using OpenCL technology. On modern GPU it takes only few hours to remove ANY open password with 40-bit key.
• Portability (Windows, Linux, MacOS versions are available)
• Running in GUI and keeps running in batch mode (as command-line utility)

• GuaPDF is the first PDF password remover ever with 20-year history and thousands of customers!
• No time nor file limits after one-time purchase
• Unlike most PDF password crackers, your PDF file is not altered in any way (except the decryption), even the file size is often the same. That minimizes the possible incompatibility of the unlocked PDF file.
• GuaPDF has special support of PDF forms.

Windows
GuaPDF v. 4.0 Free for Windows, GUI version, CPU client
GuaPDF v. 4.0 Free for Windows, command-line version, CPU+GPU clients

Here is the installation instructions with screenshots.
If you got error message like "The application has failed to start because the application configuration is incorrect" or "Code execution cannot proceed because .dll was not found" you should install Microsoft Visual C++ 2017 Redistributable Package

Linux
GuaPDF v. 4.0 Free Demo for Linux, CPU+OpenCL clients
This is demo version that has PDF size limitations

MacOS
GuaPDF v. 3.3 Free Demo for MacOS, command-line + applescript, CPU + OpenCL clients

Here is the installation instructions with screenshots.

• Q. I got the error message when starting the software: "The application has failed to start because the application configuration is incorrect" or "The code execution cannot proceed because *.dll was not found"

  A. Try to install Microsoft Visual C++ 2017 Redistributable Package

• Q: What version should I choose?

  A: If can open PDF file, but can not print, edit etc, get the restriction remover version. If you can't even open file, first of all you need to test your file (using free version) if it has 40-bit key encryption. If yes, choose password remover version. Else, your PDF file uses 128 or 256-bit encryption and you need special PDF password recovery software.

• Q: What are limitation of free GuaPDF version?

  A: Free version is now fully fucntional. In fact, unlike other PDF decrypion software, GuaPDF don't change anything in your file structure, it only decrypts all encrypted streams and strings. But, free version can decrypt only one file.

• Q: Ok, how long will it take?

  A: Restriction removal is instant (may be few minutes on very large files). 40-bit key search can take up to one day.

• Q: Are non-standard security handlers supported?

  A: No, please run DEMO to make sure your file is supported.

• Q: How to use my GPU card?

  A: GPU acceleration is needed only if your file has password to open with 40-bit key. Please make sure you run GuaPDF-OpenCL.exe.

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