What is pdfsty.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the pdfsty.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Pdfsty.exe file information

Windows Task Manager with pdfsty
Pdfsty.exe process in Windows Task Manager

The process known as Sentry for PDF or Sentry for PDF processes belongs to software PDF Complete or PDF Complete Special Edition or PDF Document Management by PDF Complete (

Description: Pdfsty.exe is not essential for Windows and will often cause problems. Pdfsty.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 658,424 bytes (22% of all occurrences), 331,552 bytes and 12 more variants. 
The software starts upon Windows startup (see Registry key: MACHINE\Run). Pdfsty.exe is not a Windows system file. The program has no visible window. The pdfsty.exe file is digitally signed. Therefore the technical security rating is 31% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with PDF Complete or PDF Complete Special Edition come up, you can remove the entire program using Windows Control Panel, ask the software vendor,, for advice or look for a new, improved version.

Recommended: Identify pdfsty.exe related errors

Important: Some malware camouflages itself as pdfsty.exe. Therefore, you should check the pdfsty.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

It's power hog! On my 2.4GHz Intel with 2GB RAM running Vista Business with no other apps running it was using 50% of CPU. Uninstall PDF Complete and it is down to 2-3%. Works fine but try other PDF software - Nitro PDF for example doesn't seem to need anything like 50%
  Seb Holmes  
pdfsty.exe - Program to deliver PDF documents as a core platform developed by PDF Complete Inc.

Summary: Average user rating of pdfsty.exe: based on 2 votes with 2 user comments. 2 users think it's neither essential nor dangerous.

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Best practices for resolving pdfsty issues

A clean and tidy computer is the key requirement for avoiding problems with pdfsty. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the pdfsty.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

pdfsty.exe [all]