Portable Document Formats, also known as PDFs, are files in which images and text are stored. The variety in individual images, graphics animations and the fonts consume a lot of space. Additionally, PDFs can be encrypted, providing security to your data. This adds to the files size, so a compression of PDF is necessary.
Compression of PDF files are done by either lossless or lossy algorithms. These algorithms help in reduce the size of the PDF file. Here are some tips to follow:
1. Every time a PDF file is edited, instead of just appending the edition, the edited file should overwrite the old version. This reduces the size of the file as every time an appendage is done, the new data is added on instead of appending the existing metadata. This can be done by using the save as option.
2. Keep a consistent font style and color, also embed all images and videos.
3. The resolution of the graphics and images can be reduced, saving space.
4. The color can be on the RYB scale instead of the CMYK scale.
5. The videos embedded can also have reduced resolution and increased frame rates.
6. The size of the fonts can be lowered.
Compression of PDF files can also be done in archived formats like ZIP or RAR.
There are other algorithms like ZIP, LZW, CCITT in which PDF compression can be done. These algorithms reduce all the data in the binary form, translating the data into its ASCII equivalents. Finally, the data is transferred in the ASCII equivalent sequence which occupies a smaller amount of space than the PDF format. The main advantage of this PDF compression method is that these are loss less algorithms, the preferred choice.