PDF file: How can I open a .PDF file?
The table below provides useful information about the .pdf file extension. It answers questions such as:
- What is the .pdf file?
- What program do I need to open a .pdf file?
- How can the .pdf file be opened, edited or printed?
- How can I convert .pdf files to another format?
We hope you find this page helpful and a valuable resource.
✅ Portable Document Format Document

The PDF file is a Portable Document Format Document. Portable Document Format (PDF) is a proprietary file format developed by Adobe Systems for representing two dimensional documents in a device independent and resolution independent format.
✅ ArcInfo Preferences Definition Data

The PDF file is an ArcInfo Preferences Definition Data. ArcInfo is a complete and extensible geographic information system.
⚠ Be careful with .pdf files.
It's important to know that the .pdf file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .pdf files. Be cautious when dealing with .pdf files from unknown sources.
🔄 .pdf converters
The following softwares are capable of converting .pdf files to other formats:
For example, using the softwares above, a .pdf file can be converted into one of the following formats:
🚫 The .pdf file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .pdf file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .pdf file
It means that the operating system does not have a default app associated with the .pdf file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .pdf file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .pdf file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .pdf file extension, write to us.