What is PDF? PDF, short name for Portable Document Format, is used as the file extension for Portable Document Format (PDF) files. .PDF files are binary files that can be opened by Adobe Reader software. See the sample .PDF file included below.

What is PDF? PDF, short name for Portable Document Format, is used as the file extension for Portable Document Format (PDF) files. .PDF files are binary files that can be opened by Adobe Reader software. See the sample .PDF file included below.

File Extension: .PDF

MIME Type: application/pdf, application/x-pdf

File Content: Portable Document Format Files

.PDF files are Portable Document Format files saved as binary files. Here are the first 64 bytes of a sample .PDF file dumped in HEX values:

25 50 44 46 2d 31 2e 35 0d 0a 25 b5 b5 b5 b5 0d .PDF.1.5........
0a 31 20 30 20 6f 62 6a 0d 0a 3c 3c 2f 54 79 70 .1.0.obj.....Typ
65 2f 43 61 74 61 6c 6f 67 2f 50 61 67 65 73 20 e.Catalog.Pages.
32 20 30 20 52 2f 4c 61 6e 67 28 65 6e 2d 55 53 2.0.R.Lang.en.US

.PDF Portable Document Format file sample: Click sample.pdf to download.

.PDF Portable Document Format files can be created and modified by these software:

• Word 2010 - Converts MS Word documents to PDF files.
• Adobe Reader - Opens and prints .PDF files.
• View and Share Documents Online - Views .PDF files online.