When there is a need to cut down the size of a file, compression techniques come handy. The file can be anything ranging from images, documents or even videos. Every file can be compressed up until a certain extent, and compression varies from file to file. Compression works by replacing multiple instances of the same objects. It replaces the redundant data into one single encapsulated object. PDF documents can also be compressed by the use of PDF compressor. It makes use of the various compression algorithms and helps reducing the file size.
A PDF compressor mainly focuses on compressing various objects in the PDF file first. Later the text is compressed. Text compression in PDF files, even with a use of PDF compressor do not yield decent results. This is due to the structure of PDF files; they are already optimized for texts. Images attached in the PDF document are compressed by various algorithms such as JPEG, FLOAT, JBIG2, etc. These are mostly lossless in nature, when quality is lost during the compression process. The PDF compressor takes the whole document as an input and automatically optimizes all the images contained within. Both post-processing and pre-processing are done and such software has options to de-speckle or de-gauss the image. This makes the loss of quality during compression almost invisible.
Several PDF compressors have a batch processing option. This is helpful especially in the case when the user has several thousand files compressed regularly. The location of the folder containing the files is fed to the PDF compressor, and the software automatically compresses every file in the folder. A time can be specified, based on which files would be compressed. PDF compressor helps in optimizing PDF documents, which is very essential especially in very low bandwidth networks. It helps reduce the upload times of large files. When a user deals with multiple files, it is advised to first compress every file and then archive them into a single file. This would help in sending the files through email.