Portable Document Format files (PDF) are used to conveniently share data. The data stored may be a mix of images, texts, animations and graphics. The data is embedded on the file and encrypted within the metadata of the file. They can be reproduced exactly as if they were not compressed at all, even after decompression. They also are reliable formats for storing data that may be useful for very long periods of time.
PDF files are bulky in nature and as the bulkiness defeats the main purpose of the format, compression of PDF files are done. PDF files can be compressed for free by using softwares that help in doing that specifically or by using a PDF editor.
Using a PDF editor, space-consuming parts like videos and graphics are reduced affecting clarity , the font size is reduced and the variety in the styles and colours of fonts and backgrounds are minimized to large extents. The
Free PDF file compressors are available over the internet. These free PDF compressors actually edit the PDF file in such a way that the data stored is not lost, but the effective size of the file is reduced. They do indeed reduce the file size of the videos and animations present by reducing their clarity. However, the compression is done mainly by editing the metadata and the text data in the file.
The free PDF file compressors scan the metadata, replace repetitive lines by using a string and removes duplicating sequences from the encoding. Sometimes, in the metadata, some unused parts may also be present. The free PDF file compressor detects such parts of the metadata and removes them. Unnecessary parts in the file like name destinations are detected and removed automatically, reducing the size of the file by a large margin.
The most popular free PDF file Compressor is Free PDF Compressor which is available on the internet.