The Need of PDF Compression
Reducing the size of a file implies compressing the volume of electronic data in it. More precisely, it means reducing the number of bits that data occupies. Data compression ensures saving disk space and quick file handling. PDF (portable document format) files are ideal for compression. These files allow clear documentation and ease in sharing. The universality of the PDF format makes them perfect for storage. PDF files look the same irrespective of the operating system on which they are opened. All you need to view them is a PDF reader. But PDFs containing high resolution content such as images and videos or a good number of pages can be very bulky. They take long to load. They occupy a lot of storage space and are inconvenient to work with. It is here that reducing the size of PDF files is needed. With compression these bulky files become convenient to work with.
The Algorithms of PDF Compression
The size of PDF file is reduced by using various algorithms. This can be broadly grouped as lossless and lossy. Lossless compression algorithms spot the logical patterns in the data that is to be compressed and condenses them in a way that they will be reconstructed once the file is opened. This compression technique when applied leads to reduction in size of the PDF file without any loss of data. Lossy compression algorithms achieve maximum compression but leads to certain loss of data. However, this loss is barely perceptible to human senses. The right algorithm for reducing the size of PDF file has to be chosen according to the output desired. The usual lossless compression algorithms are CCITT, Flate, LZW, RLE and ZIP; lossy algorithms comprise JPG and JPG2000.
The PDF Compression Software
If you are seeking to buy a PDF compression software, always purchase one that has both lossy and lossless compression algorithms. This will give you flexibility in reducing file size of PDF documents. But always check the compression rate as this sometimes varies from software to software. Added to this, the PDF compression software comes with features like conversion of any file format to PDF for reducing file size. They also have OCR option to make the compressed PDF text-searchable.