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The PDF format is ideal for presenting and sharing complex texts, diagrams, graphics and forms. However, PDF files are therefore often very extensive, which in turn is actually a knockout criterion for sharing. With PDF-compress you can optimize your PDF files so that they do not take up more storage space than absolutely necessary. Depending on the structure and content of the PDF document, compression rates of up to 95% can be achieved. In a test with over 1,000 randomly selected PDF files from different sources, an average compression rate of almost 50% was achieved. PDF-compress uses different approaches for compression. For example, images contained in the document can be compressed losslessly, special optimization technology (MRC) can be applied, and blank pages and annotations can be removed from the PDF structure. Optionally, the image quality can also be reduced in several stages and an optimization for the display on the web can be carried out.