Need for Compressing PDF Files
The most popular among document formats, PDF or Portable Digital Format, has a number of advantages as a documentation format. Firstly, the format supports text data, image, and hyperlinks and hence is the most useful for web publishing. The document can be converted to/from various different formats of documents. People having different system platforms can share these files easily, as these files require only a PDF reader in the system to view them. Users can procure these files and convert them to any desired format in their computer. As a result, PDF files are being used by many companies these days to manage their files easily. However, there is a major disadvantage in using the PDF files. These files can be large and occupy larger memory than ordinary text documents. Thus, for efficient usage, there is a need to compress PDF files.

How to Compress PDF Files
To compress PDF files, there are a number of PDF compression tools available today. These PDF compression tools help the user compress PDF files with certain compression algorithms. There are two methods to compress PDF files; the lossless and the lossy methods of compression. The lossy method of compression is able to provide a very high degree of compression but at the cost of loss of quality of the file being compressed. The lossless compression on the other hand provides a relatively lesser scale of compression, but no quality is lost. There are other simpler methods other than these algorithms, to compress PDF files. Creating PDF files, by eradicating tags in the file, and sampling the images to be used in the file helps to reduce the size of the file. We can also remove unwanted objects like annotations, form fields, java scripts etc from the file to reduce the size.
PDF Compression Software
Finding good PDF compression software is not a difficult task. There are many types of PDF compression software available online. Some PDF compression tools are available for direct use online! All the user has to do is upload the file which requires to be compressed to the website and specify his e-mail id. The compressed file is sent to his e-mail id. This type of compression is what is known as online PDF compression, and it can be used easily for a limited number of files.