PDF File Extension

PDF file icon
Portable Document Format Format
  • Developer
    Adobe Systems
  • Popularity
    3.7 (27 votes)

What is PDF file?

Files with the .PDF extension contains text or graphic documents, stored in a format designed in order to provide portability between applications and platforms. It stores a flat document of constant appearance, a digital printout. Specification was developed in the 90s by the Adobe company. It is based on the PostScript language. Since 2008 it is an open format, defined in ISO 32000 – previously it was a proprietary file format.

Current implementation enables to place within a document:

  • Text and fonts,
  • Vector graphic and raster images,
  • Annotations,
  • Forms,
  • Layers,
  • 3D objects,
  • Multimedia (including video content)

PDF file can be encrypted and signed digitally, and it may include metadata and attachments. It is a synthesis of the PostScript programming language, font nesting system, and structural storing of data within a single file, compressed if necessary.

The technology behind PDF files

In the process of creating PDF files, these 3 technologies are utilised:

  1. PostScript – in order to generate content, graphic and layout
  2. System embedding fonts used within a document – enables to change them and transfer along with the documents
  3. Structural mass memory system – enables to merge all elements and any additional content into a single file, utilising data compression if necessary.

Conversion of a PDF file

When you install one of the applications from the list of programs that you found here, you should be able to open or edit the file with the PDF extension without any issue. However, if you still have problems with this, you may use the option of PDF file conversion to a different format.

File Conversions from PDF extension to a different format
File conversions from other format to PDF file

We hope we helped you solve the problem with the PDF file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.

What else may cause problems?

There can be more reasons which determine that you are not able to open the PDF file (apart from the lack of the proper application installed).

First - the PDF file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the PDF file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the PDF file should be solved.

Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the PDF file has not been completed and it cannot be opened properly).

Do you want to help?

If you have additional information about the PDF 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 PDF file.

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


Ogg Vorbis Audio Format

OGG files refer both to audio and multimedia container files. This means, that they may include compressed audio, video or text data (for example: ...