Thegrideon Software
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PDF Password Recovery tool

PDF Password Recovery

  • PDF Password by is a feature-rich tool for PDF decryption, password recovery and unprotection (access restrictions removal).
  • It works with pdf's from all Acrobat versions.
  • All encryption methods are supported: 40 - 128 bit RC4, 128 - 256 bit AES, ...

PDF Password Recovery Features:

  • .pdf files without password to open can be instantly saved with restrictions cleared.
  • .pdf files with user password and 40bit encryption can be decrypted with guarantee. more info
  • Several attacks can be configured and queued for pdf files with 128-256 bit encryption: more info
    • brute-force attacks based on charset and length selected;
    • dictionary attacks with modifications (several wordlists are included):
      • password in reverse;
      • capitalized, uppercase, lowercase, mixed case;
      • predefined char replacements: Bb with 8, Aa with 4, Ss with $, etc.
      • custom char replacements
      • advanced keyboard layouts-aware recovery technique;
    • mixed attacks for precise search range configuration;
    • multi-position modifications to cover modern password policies;
  • Highly optimized code (SSE, AVX, AES-NI) guarantees maximum performance. recovery speed
  • Supports up to 64 simultaneous processing threads (multi-CPU, multi-GPU).
  • Utilizes NVIDIA and AMD GPUs with a high-performance methods.
  • Utilizes modern Intel HD Graphics GPUs.
  • All types of encryption are supported.
  • Guaranteed 40bit Key Recovery Service is available.
  • Windows 7 - Windows 10.

Program Screenshots:

PDF Password Recovery Dialog Password recovery attacks

Support and Contacts

Please, feel free to contact us. Just go to the contact page and send us a message, or visit our Support forum.

Additional Information:

No password to open (view) or password is known:
Acrobat 3.0 - Acrobat XI:
PDF file saved with "owner" password protection can have access restrictions also known as permissions (e.g. no printing, no editing, no coping, etc.), but can be opened without "user" password. These files can be unprotected (saved with all restrictions removed) instantly. If "user" password is set, but known you can enter it into PDF Password and save unprotected file.

Password to open is set and unknown:
Acrobat 3.0
Files protected with 40 bit RC4 encryption (Acrobat 3.0) can be decrypted with guarantee by recovering the encryption key used. Encryption key recovery can take up to several days on slow PC, but with multi-threaded highly optimized code and GPU acceleration encryption key can be recovered in several hours. Please check the time table below for guideline numbers.
Yet another option is to use "file signature" string available in PDF Password log. We can calculate your file 40bit encryption key in minutes from the "file signature" with the set of pre-calculated tables for a small per file fee. Please contact us for details.

Acrobat 5.0 - Acrobat 7.0:
The most common protection used right now is 128bit RC4 or AES encryption (Acrobat 5.0 - Acrobat 7.0). There is no way to recover encryption key with guarantee unfortunately, so exhaustive password search is required and PDF Password provide you with the set of configurable attacks (dictionary, brute-force, mixed). PDF Password is equipped with highly optimized low-level code and GPU acceleration is available to raise password recovery speed. You can check guideline figures in the table below and you will see they are not just higher than for most other tools, but way higher.

Acrobat 9.0
AES 256bit encryption was introduced in Acrobat 9.0 but the password verification method was discontinued in Acrobat X. Exhaustive password search is required, but the recovery speed is millions of passwords per second. Actual data is available in the table below.

Acrobat X - Acrobat XI:
Acrobat X-XI uses AES 256bit encryption with the very complex password verification algorithm based on SHA256, SHA384, SHA512 and AES128. Exhaustive password search is required and recovery speed is limited, but we spend a lot of time to optimize PDF Password code and you will find the speed is fastest available.

Recovery time for 40bit Encryption Key:
The following table is just an example with the common laptop, desktops and server CPUs and GPUs:
The time shown is equal to maximum time necessary to check all possible "encryption keys" and the key search for most files require just a portion of this time.

Intel® Core™2 Duo
T7500 @ 2.20GHz
Intel® Core™ i3
2100 @ 3.10GHz
Intel® Core™ i7
2600 @ 3.40GHz
2 x Intel® Xeon®
X5570 @ 2.93GHz
2 x Intel® Xeon®
E5-2670 @ 2.60GHz
~2.5 days ~1.5 days ~17 hours ~10 hours ~5 hours
Intel® i3 2100 @ 3.10GHz +
AMD Radeon™ HD 6770
(~ equivalent gtx 550 ti)
Intel® i3 2100 @ 3.10GHz +
NVIDIA® GeForce® GTX 470
(~ equivalent HD 5850)
Intel® i3 4130 @ 3.40GHz +
integrated Intel® HD 4400 +
AMD Radeon™ R9 270
~14 hours ~11 hours ~8 hours

Average password recovery speed for 128-256bit encryption:
The following table is based on several tests with the common laptop, desktops and server CPUs and GPUs:

Acrobat 5.0 - 7.0:
Acrobat 9.0:
Acrobat X, XI:
Intel® Core™2 Duo
T7500 @ 2.20GHz
Intel® Atom™
Z3740 @ 1.33GHz
Intel® Core™ i3
2100 @ 3.10GHz
Intel® Core™ i7
2600 @ 3.40GHz
2 x Intel® Xeon®
E5-2670 @ 2.60GHz
~172 000 pass/s ~200 000 pass/s ~350 000 pass/s ~750 000 pass/s ~2 400 000 pass/s
> 6 millions p/s > 8 millions p/s > 12 millions p/s > 20 millions p/s > 75 millions p/s
~380 pass/s ~480 pass/s ~780 pass/s ~2 200 pass/s ~6 700 pass/s
Acrobat 5.0 - 7.0:
HD 4400 GPU
GeForce® GT 640
AMD Radeon™
HD 6770
AMD Radeon™
R9 270
NVIDIA® GeForce®
GTX 470
+ 240 000 pass/s + 270 000 pass/s + 765 000 pass/s + 875 000 pass/s + 1 175 000 pass/s

GPU performance is somewhat variable with number of factors including GPU/CPU combination and even driver version. Please contact us if your recovery speed is noticeable different from the data above.

Trial and Registration:

Trial version allows you to setup and test run any password search for up to 15 min per set or search for file encryption key. Unprotected files can be saved from registered version only.

With the "Home User" License, you can use the program for non-commercial purposes in non-business, non-commercial environment (personal files). To use the program in a corporate, government or business environment (clients or corporate files), you should purchase the "Business User" License.

Home User license is only $29.95 and Business User license is $44.95.

After payment processing is completed, you will immediately receive the email with your registration key. The key should be entered into the evaluation version, which can be downloaded from this page.

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