NPDF File Extension

NPDF file icon
Normal PDF Document Format

What is NPDF file?

NPDF is a file extension commonly associated with Normal PDF Document Format files. NPDF file format is compatible with software that can be installed on Mac OS, Windows system platform. NPDF file format, along with 364 other file formats, belongs to the Text Files category. Users are advised to use Adobe Acrobat Reader software for managing NPDF files, although 1 other programs can also handle this type of file. On the official website of Adobe Systems Incorporated developer not only will you find detailed information about theAdobe Acrobat Reader software, but also about NPDF and other supported file formats.

Programs which support NPDF file extension

Below you will find an index of software programs that can be used to open NPDF files divided into 2 categories according to system platform supported. Files with NPDF extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Programs that support NPDF file

Updated: 07/15/2020

How to open file with NPDF extension?

There can be multiple causes why you have problems with opening NPDF files on given system. Fortunately, most common problems with NPDF files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The list below will guide you through the process of addressing the encountered problem.

Step 1. Download and install Adobe Acrobat Reader

Install software to open NPDF file Problems with opening and working with NPDF files are most probably having to do with no proper software compatible with NPDF files being present on your machine. This issue can be addressed by downloading and installing Adobe Acrobat Reader or different compatible program, such as Adobe Acrobat. The full list of programs grouped by operating systems can be found above. If you want to download Adobe Acrobat Reader installer in the most secured manner, we suggest you visit Adobe Systems Incorporated website and download from their official repositories.

Step 2. Update Adobe Acrobat Reader to the latest version

Update software that support file extension NPDFIf the problems with opening NPDF files still occur even after installing Adobe Acrobat Reader, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of Adobe Acrobat Reader is available. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. This can be one of the causes why NPDF files are not compatible with Adobe Acrobat Reader. The latest version of Adobe Acrobat Reader should support all file formats that where compatible with older versions of the software.

Step 3. Assign Adobe Acrobat Reader to NPDF files

If you have the latest version of Adobe Acrobat Reader installed and the problem persists, select it as the default program to be used to manage NPDF on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Associate software with NPDF file on Windows

The procedure to change the default program in Windows

  • Choose the Open with entry from the file menu accessed by right-mouse clicking on the NPDF file
  • Click Choose another app and then select More apps option
  • The last step is to select Look for another app on this PC option supply the directory path to the folder where Adobe Acrobat Reader is installed. Now all that is left is to confirm your choice by selecting Always use this app to open NPDF files and clicking OK.
Associate software with NPDF file on Mac

The procedure to change the default program in Mac OS

  • From the drop-down menu, accessed by clicking the file with NPDF extension, select Information
  • Find the Open with option – click the title if its hidden
  • Select Adobe Acrobat Reader and click Change for all...
  • A message window should appear informing that This change will be applied to all files with NPDF extension. By clicking Continue you confirm your selection.

Step 4. Verify that the NPDF is not faulty

Should the problem still occur after following steps 1-3, check if the NPDF file is valid. Being unable to access the file can be related to various issues.

Check NPDF file for viruses
1. Check the NPDF file for viruses or malware

If the NPDF is indeed infected, it is possible that the malware is blocking it from opening. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the NPDF file is indeed infected follow the instructions below.

2. Verify that the NPDF file’s structure is intact

If you obtained the problematic NPDF file from a third party, ask them to supply you with another copy. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. When downloading the file with NPDF extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Ensure that you have appropriate access rights

Some files require elevated access rights to open them. Log in using an administrative account and see If this solves the problem.

4. Check whether your system can handle Adobe Acrobat Reader

The operating systems may note enough free resources to run the application that support NPDF files. Close all running programs and try opening the NPDF file.

5. Check if you have the latest updates to the operating system and drivers

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with Normal PDF Document Format file. It may be the case that the NPDF files work properly with updated software that addresses some system bugs.

Do you want to help?

If you have additional information about the NPDF file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on NPDF file.

Top File Extensions
Show more
File Extension of the day
crdownload icon


Chrome Partially Downloaded Format

Files with the .CRDOWNLOAD extension contain data partially downloaded by the download manager of the Google Chrome Internet browser. The file can ...