For example, if you save a complex Illustrator file with large amounts of raster data embedded (i.e., not linked) as a PDF file and request the option by which that PDF file remain editable in Illustrator, all content in the Illustrator file is kept as a separate private data area in the resultant PDF file – typically such files are double or more the size of the PDF file without that option. (2) What quality degradation you are willing to tolerate? A PDF file in which 300 dpi images in ZIP compression are downsampled to 72dpi with the highest compression / lowest quality JPEG settings might be tolerable on old 15 inch low resolution monitors, but simply are unacceptable for printing or display on high resolution devices including today's nearly 300dpi phones and tablets (as well as large 4K UHD monitors). And it is unlikely that you will see significant if any size reduction in a file that is totally vector and/or text-based. An original PDF file with significant high resolution raster graphics will yield more size reduction than a similar PDF file with low resolution, low quality raster graphics. On the Reduce File Size dialog box, select Acrobat 10.0 and later in the Make compatible with drop-down list box. Once the document is open: Select File > Save as Other > Reduced Size PDF. (1) The contents of the original PDF file. Once you launch Acrobat DC, use the File > Open menu commands to open the PDF document that you would like to shrink.

The results of either Reduced Size PDF and Optimized PDF in terms of resultant file size depend upon: This feature is actually a headless version of File=>Save As Other=>Optimized PDF in which downsampling and similar settings are set to values that hopefully won't ruin quality too much. That option still exists in Acrobat DC!! You choose File=>Save As Other=>Reduced Size PDF. (Settings are available in Acrobat for these parameters!) In each case, you risk reducing the quality of what you see either on screen or print to the point where it is unacceptable due to lack of image resolution (typically yielding fuzzy-wuzziness) and/or compression artifacts. In terms of raster images, size reductions come at the cost of either reducing the images' resolutions, applying lossier compression, or both of these techniques. In terms of any text and vector content in the PDF file, the only significant size reductions that you can effect are associated with compressing the object streams, a feature of PDF 1.5 or later (if you need PDF 1.4 or earlier, this optimization isn't available). The size of a PDF file depends on (1) the type and amount of content on the pages and (2) the degree to which you wish to degrade quality of the content of those pages. Simply stated, you cannot legislate the size of a PDF file. There is not necessarily a “significant problem with Acrobat” but perhaps a problem with either your settings for reducing files size or even your expectations.

Adobe acrobat dc reduce file size