A large document is impractical to be transferred over a low speed network. The document can rather be compressed than cutting down on its content. Portable Document Format is the most widely used document format. The reason for its wide use is mainly due to its portability, versatility and its flexible nature. These properties are essentially due to its efficient core structure itself. It acts as a template which can hold multiple objects in itself. These objects can be pictures, texts, fonts, information, etc. But during instances when there are several such objects embedded in the document, the file size tends to be really big. PDF Compression is the only efficient solution for this problem.
PDF Compression can be achieved in several ways. The first method is to follow some specific set of rules which would normally help to reduce the file size. Saving the file from scratch for each re-save is one such most important rule. In case of a heavier compression, several software exist that do the job perfectly. These techniques are based upon well known compression algorithms such as Adaptive Huffman Compression and LZW. These PDF Compression options are most likely to be present in the PDF creation or conversion software itself. It is present as a default drop down option in few Operating Systems like Mac Os. There is PDF Compression software available in the market which really gives a good compression ratio. Such software generally come with a price, but is worth the pay. For regular home purposes, free PDF compression software are also available.
PDF compression can take a long time depending on the file size and the number of objects embedded. But as a general rule of thumb, optimizing all the import images result in a smaller file size. This is due to the fact that 80% of the size of the document is due to the embedded images or objects. Images can be optimized by either reconverting them to JPG, GIF, and PNG format or by decreasing their overall resolution. Deleting unused font information is also a good choice. PDF compression will not only help in saving the storage space, but will speed up upload times by several folds.