Portable Document Format, commonly abbreviated as PDF is a very common file format by means of which data in is transferred easily. The PDF format is chosen for transportation of data because the format is a stable format and also, the data present in the file cannot be tampered with. PDF files are created by using a creation tool separately which is available for all operating systems or by using a software which is integrated with an OCR system in which creation of PDF files are enabled. The PDF file thus created may have images, animations, videos and texts in various colours and formats. All these are to be encrypted in the metadata of the file and ultimately, the size of the file becomes too bulky to be used for distribution of data. Hence, PDF compression is used.
PDF compression software is available as freeware as well as retail-ware on the internet. The PDF compression downloads can be done from the internet and after the installation is done, they can be used in the computer for compression of the portable document format files.
PDF compression downloads are softwares that compress the file by many means like reducing the spacing between the lines and removing unnecessary spaces. The compression is also done by reducing the size of the images that are embedded in the file by reducing its resolution and also by reducing the colour contrast. Even the videos embedded can be reduced in size by increasing the frame width and number of frames per second.
The PDF compression downloads reduce the size of the files by removing the unnecessary components in metadata that are not used or parts that are repeated often and strings to represent the repeated data is used instead of it, thereby reducing the size of the PDF file.
Some of the most prominent lossless PDF compression downloads are otherwise called as lossless compression techniques. In these method, the data is converted into binary equivalents and then the ASCII equivalents. Finally, the data is stored by occupying a space much lesser than the original space required. When the data is required, during expansion of the file, all the data that was stored is returned without any losses by conversion from ASCII values to Binary Values and then to the normal values.