Since we published our tutorial on how to compress a PDF file, we have made some changes to the compression algorithm. Instead of having to choose a quality, resolution, and color for your PDF file, you can now easily choose one of the four presets that are optimized for different devices.
This article, as an update to the initial tutorial, will explain the presets used on PDF2Go to compress a PDF.
File Size Reduction Presets
Formerly, the file compression on PDF2Go offered different options to a user who wanted to reduce the file size of their PDF document:
- Quality of the PDF
- Quality of the contained images
- Resolution of the contained images
- Color of the PDF
This has become a lot easier and faster by now! Instead of those four options, now there is only one: Quality of PDF. When choosing a quality, you can choose between four popular presets that will determine the file size of your PDF. Following, they are explained in more detail:
This preset really deserves its name. It will reduce the file size of your PDF insanely, but thus also reduce the quality accordingly. Images will have merely 20 dpi.
This setting reduces your PDF to the absolute minimum of quality possible for maximal compression. Images are reduced to 40 dpi.
This option is perfect for all kinds of screens. The quality of the PDF is accordingly good, yet images are reduced to 72 dpi.
As the name suggests, these PDFs will be compressed to fit eBook standards and e-reader screens. The quality is rather low and images have a quality of 150 dpi.
Compression using this preset is optimizing your PDF for personal printing. The overall quality is set to high and images will have 300 dpi.
This preset maintains the highest quality of the compressed PDF document since it was created with professional printing in mind. The quality is high, all colors are preserved and images retain a dpi of 300.
How Effective Are These Presets?
What’s really interesting, however, is to see how much the file size can be reduced when using our compression presets. To test, we used a PDF document that, in its original state, had a size of 1,35 KB.
Let’s have a look at the resulting file sizes after compressing it:
- Insane: 533 KB
- Minimum: 544 KB
- Screen: 574 KB
- eBook: 692 KB
- Printer: 1,44 MB
- Prepress: 1,85 MB
As you can see, the first two presets resulted in a PDF file with a reduced file size. The “prepress” & “printer” presets actually increased the file size though. Why is that so? The PDF we used for testing has been saved in a lower quality than used in the “prepress” or “printer” presets. Thus, since the quality was optimized and therefore raised for those special presets.