PDF is a flexible file format, which is device and platform independent. Moreover, PDF format supports compression of text and images. This accounts for the immense popularity for the format supporting file storage and faster transfer.
The PDF file compression is executed by program using formulas and algorithms to chart out the best method to compress files. The algorithm used in the PDF file compressor determines the quality of the compressed file. The PDF compressor algorithms can be broadly divided into two, based on the way it works on the file. They are lossy algorithm and lossless algorithm.
Lossless algorithm, as the name denotes, doesnt lose any detail of the file compressed. The compressed file can be restored to the original without losing the quality or information. This type of compression is useful in compressing program files and archiving masterpieces. But there is a limit to the file size to which the file can be compressed.
Lossy algorithm filters out information in the file and discards some, to make the file smaller. This works well for ordinary image and sound files. However, the discarded details are lost forever. So when restored, these files do not have the same quality or clarity. In spite of this loss of quality, lossy compression is popular, as it can compress files to any desired sizes. There are PDF compressors available, in which you can set the file size and quality of the compressed file.
The world over, many are still using dial-up connection for Internet connectivity. By compressing files, it is easier to upload the files in the web pages and to download files and programs from the Net. Without compression, dial-up users are left stranded, as it is beyond the capacity of their connection to deal with file sizes of 50 MB or above.