Guaranteed PDF Decrypter / Restrictions Remover


PDF password and restrictions remover

New 4.0 version

This is an utility to bypass the security on PDF documents (of course, you should have the right to do it, for example, in case of forgotten user/owner password). Only standard PDF security is supported , neither third-party plug-ins nor e-books. Both protection methods are cracked:
  • restricted operations on file can be disabled (instantly, any Acrobat version up to 7.x, even with 256-bit AES encryption).
  • password encrypted file can be decrypted (in a several days, Acrobat ver. 3.x, 4.x, 40-bit key);

It also can be used to decrypt files you know password for.

This is GUI utility for Win32 and command-line utility for Linux and Solaris/SunOS, Mac OS.

If you don't want to read anymore, download and run the DEMO version, order the commercial version it recommends.
PDF security overview
The standard security provided by PDF consists of two different methods and two different passwords. A PDF document may be protected by password for opening ('user' password) and the document may also specify operations that should be restricted even when the document is decrypted: printing; copying text and graphics out of the document; modifying the document; and adding or modifying text notes and AcroForm fields (using 'owner' password). An examples of restricted and encrypted files you'll find in the distribution archive.
Method to decrypt files with password for opening (Acrobat 3.x, 4.x only)
Most password crackers are trying to determine right password by testing passwords (using brute-force or dictionary attacks). This method is good only for short and non-complex passwords. To find 8-character password consisting of lowercase Latin letters and digits you'll need about 20 days. But what if password is longer or consists of special characters or national symbols?

(Un)fortunately, another method to decrypt PDF files exists. PDF security (including Acrobat 3, 4 scheme and Acrobat 5-8 40-bit encryption) uses strong enough encryption algorithm, but because of U.S. crypto export regulations the key length is only 40 bits. So, you need to test only 240 keys to decrypt your file with guarantee. GuaPDF does it, and key testing will take about 3 days on the Core 2 Duo E6300 PC. Within this time (and in average within the half of this time) ANY file, encrypted with ANY password (no matter what length of the password is or what language or symbols used, etc) can be decrypted.

Moreover, GuaPDF offers distributed computing mechanism (via the shared directory) and you should divide the necessary time to the quantity of PCs you've got.

GuaPDF is the unique software with full support of Acrobat 7, 8 files (including compressed files and AES encryption)
Advantages of GuaPDF are:
  • Guarantee of decryption
  • New PDF 1.7 (Acrobat 8.x) files support, including AES encryption, compressed files and unencrypted metadata
  • Very high speed (optimized for Pentium II/III, Pentium 4, NEW Core 2 and AMD architecture)
  • Confidentiality (you crack your secret files, not someone from cracking service)
  • Version for individual user and network version to use power of distributed clients or dual (dual-core) processors
  • Portability (DOS, any Windows, Linux and Solaris versions are available)
  • Running in GUI and keeps running in batch mode (as command-line utility)
The best way to choose version you need is to run DEMO.
There are some GuaPDF versions:
  • DEMO (freeware) version. It demonstrates processing of both security methods but has some limitations and can correctly decrypt only small files. It also doesn't contain distributed computing mechanism.
  • RESTRICTIONS REMOVER. This version can only unset operation restrictions (i.e. remove owner password) and can not decrypt password-protected files. (€/$25)
  • PASSWORD REMOVER. These versions process both security methods (i.e. user and owner passwords), have distributed computing mechanism but number of distributed clients are limited (from €/$39).
    Now 2-clients version for the owners of dual, dual-core and Prescott HyperThreading processors for the price of 1-client!

All these version are licensed for non-commercial purposes only. If you wish to use GuaPDF to make any profit you should use

  • UNLIMITED, most powerful version. It does everything, has no limitations. (€/$150)
Version Restrictions (or owner password) removal Key searching Decryption using found key (user password removal) Distributed mechanism License Average time to decrypt (on Core 2 Duo E6300) Price
Acrobat 3.x-9.x even with 256-bit key Acrobat 3.x, 4.x, 40-bit key
Demo YES (only small files) YES YES (only small files) NO (single computer) Freely distributable 1 week FREE
Restrictions remover Instantly - - - Non - commercial instantly €/$25
1-client/2-clients Instantly YES YES NO (single computer) Non - commercial 3 days (on 2 cores) €/$39
5-clients Instantly YES YES YES, 5 clients max. Non - commercial 1 day (on 5 clients) €/$49
Unlimited Instantly YES YES YES, any number of clients Any purposes (except distribution) Depends of number of clients €/$150

UPDATED GuaPDF v. 4.0 DEMO for Win32, GUI version (140K)

GuaPDF v. 4.0 DEMO for Win32, command-line version (70K)

GuaPDF v. 2.3 DEMO for Linux (ELF, static, 220K)

GuaPDF v. 2.2 BETA DEMO for Solaris/SunOS (ELF, static, 150K)

Please test your file before purchasing using the DEMO version

Order the commercial versions over the Internet worldwide using secure connection. This means no one can intercept your confidential information. (Please note I also don't have an access to this information because card will be charged by ordering services listed below). The temporarily link to the fully functional version you recieve immediately after verifying your order. Normally you'll get the program within 10-15 minutes.
PDF Restricions Remover
PDF Password Remover
Name and address
ShareIt! element 5 AG Vogelsanger Str. 78 D-50823 Cologne Germany
Order GuaPDF 4.0 commercial (restrictions remover)
USD/Euro (1€ = 1$ !)
Credit cards
Visa, Mastercard/Eurocard, American Express and Diner's Club
Visa, Mastercard/Eurocard, American Express and Discover
Other methods
Bank/wire transfer, check, cash. Fax.
Check/money order by mail. Fax. Purchase order.
More info

Upgrade from 1.x to 2.x OR from restrictions remover to 2-client for $/€ 15.95 here

If you won't get the program within 12 hours after ordering, please contact me!

Below is a special offer for exUSSR customers.


Q: What version should I choose?
A: Just run DEMO version and it will print it. Briefly, if you can open PDF file, but can not print, edit etc, get the restriction remover version. If you even can not open file, get n-clients version.

Q: I've tested GuaPDF on my file, but got only blank pages (or some errors)
A: It is DEMO version, it can process small files only. 

Q: Ok, but how can I sure the full version will work on my file?
A: If DEMO parses your file with no errors, the full version will work fine. 

Q: Ok, how long will it take?
A: Restriction removal is instant (may be few minutes on very large files). To estimate key searching time, run DEMO version (and divide it to the number of your PCs).

Q: Are non-standard security handlers supported?
A: No, please run DEMO to make sure your file is supported.

More questions and answers you'll find in the included documentation.
Only legal customers are supported. No claims and question about freeware version will be accepted, but I'll appreciate the constructive feedback. Also contact me if you have any problems with ordering the program.

Please send any comments and bugs to In case of the bug reported I'll update program as soon as possible.

You may submit your opinion / read others opinions here.

Version history
  • Acrobat 8 (PDF 1.7) support
  • Core 2 optimizaition. The theoretical value of 1100 ticks per password has been beat.
  • Some parsing bugs fixed
  • "Illegal instruction" bug on AMD fixed (Linux version).
  • Serious AES decryption bug fixed
  • Acrobat 7 (PDF 1.6) support including AES encryption and unencrypted metadata feature (restrictions removal only)
  • 10-25% speed-up on Pentium 4 and AMD. Kernel crypto function for any processor now can be easily added and the best rate functions are chosen automatically. New /pXXX option. (n-clients version only).
  • 2-clients version instead of 1-client (for the same price) to use the power of dual/dual-core processors.
  • DEMO limitation changed, now FREE version doesn't stop but produces the file with few readable pages.
  • Solaris BETA version available
  • Few decryption and comptatibility bugs fixed.
  • GUI version available, command-line is now full Win32 application
  • Engine fully rewritten, Acrobat 6.0 (PDF 1.5) support, no more "String truncated" warnings (at least, up to PDF 1.4)
  • Pentium 4 optimization
  • More accurate estimated time calculation
  • Acrobat 5 (PDF 1.4) 128-bit encryption support - restrictions removal only, files encrypted with user password can't be guaranteed decrypted.
  • Few parsing bugs have been fixed
  • First client now can be considered as "server". The decryption is performed on this client only. New /1 option. (n-clients versions only).
  • Demo limitations has been changed slightly, now it can decrypt larger files.
  • Linux version available.
  • /p option has been extended, now you can decrypt files with known onwer password instantly. Restrictions remover version hasn't been changed.
  • key testing is 5% faster
  • new options /p, /y
  • fixed minor bugs in parsing and decrypting
  • some interface improvement
  • First (BETA) version released.

Last updated:

© Pavel Semjanov, 2000-04