Compress PDF Size the Need
Portable Document Format documents are used mainly for transferring data over the net. However, the PDF files become large due to the amount and variety in data that is stored in the file. A PDF file consists of images and videos which increase the file size. The major contributor to the file size of the PDF document is the metadata of the file. It consists of details on all the data that is stored in the file, history of editions made to the file and the like. This contributes to the longer lifetime of the file, but at the cost of increased file size. Hence, compress PDF size is used so that the PDFs file size is reduced to stay ideal for sharing of data.
Methods of Compress PDF Size
Compress PDF size is done by two methods namely lossless and lossy methods. Lossless methods are ones in which data is compressed and decompressed without any losses. In lossy methods, data which is not used is deleted so as to reduce the amount of space that is occupied. Duplicate images, redundant codes, unused parts of the PDF, etc are deleted. For compress PDF size, the resolution of the images can be reduced. The bit rate of the videos stored in the file can be reduced. All these reduce the amount of space occupied. Some of the lossless methods are LZW, ZIP and RAR which store coded equivalents of the data instead of the data itself.
Compress PDF Size Software
Compress PDF size software use lossless or lossy algorithms and compress the files. The only advantage is that compress PDF size is done automatically, as opposed to manual compress PDF size. There are many software which follow both algorithms. Lossy PDF compressors even delete unused bookmarks and images from the file. They also group repetitive parts in the metadata and reduce many lines in the metadata. Sometimes, the data that is stored is cleared of all formatting and made into simple text so as to remove the extra lines of code from the metadata. The efficiency of compression software is affected by the data that is lost in the process of compression and the more the amount of data lost, the less is the efficiency.