Portable Document Format or PDF is the most preferred file format when it comes to file or document transfer. Conversion can be done from other file formats to PDF. The memory utilization in this format is very less compared to other formats. This might not still be satisfactory since the size will still be quite large for data transfer. This will continue to pose problems when extremely large sized PDF files have to be used on the internet for displaying information on sites or being sent as an attachment in an email.
Thus the necessity to shrink a PDF file becomes important. PDF file compression results in the reduction of file size to increase space utilization and increase its usability when it is used for web purposes. The shrinking of the PDF file can be done in numerous ways. The most basic method is replacing consecutive spaces with a new line or redundant characters by a single encoded character. Some strings are substituted with a string of lesser length to aid compression. This results in shrinking the size of PDF files by at least half of the original document.
The process of shrinking of the size PDF file is very efficient and easy to implement. Reliable software that compresses the PDF file is required. A large number of such software is available for download over the internet. The installation is carried out and the file that needs to be shrunk is selected and the output location is also specified. The output compressed PDF file is created and saved in the location. Most of the PDF reader software available in the market come with these feature in built in them.
The factors affecting the shrinking of the PDF file are original file size and the compression algorithm. Other parameters that play a role in the shrinking of the PDF file are resolution of the file, image format, fonts used in the document, embedment of text, etc. The shrinking of PDF file is both lossy and lossless. This process is similar to image compression as PDF stores data in the form of images.