Are you facing a regular problem of bounced e-mail attachments? Or unnecessarily long downloads? Are you getting higher-than-necessary bandwidth bills? Then you must pay attention to your PDF files which you are transmitting through internet. Your PDF files need to be shrinked.
Whenever your PDF contains number of images or various fonts, the size of PDF is likely to increase which gives rise to all above problems. Balancing quality and file size in PDFs is quite tricky. PDF files tend to increase in size mainly due to three main reasons, - images, fonts and the PDF format itself.
Generally images cause the main trouble. Many programs embed images at much higher resolutions than you'd ever actually display. By shrinking these images size you can save a lot of space. Similarly fonts can add bulk. However if you have used standard fonts,t hen there is little need to embed them in the file and if you are using nonstandard fonts, you can embed only the characters you use, rather than the entire font. Also if you do a lot of editing and page replacement in Preview or Adobe Acrobat the size of your file will grow every time you save it.
Thus the main factors affecting the size of a PDF are image resolution, image type, fonts and how they're embedded, PDF version and the level of compression/shrinkage.
Following are few tricks to shrink the size of your PDF:
Use the Save As Command: When you need to make any changes to your PDF, select Save As to overwrite the entire PDF.
Named Destinations: Named destinations are markers that identify locations in a PDF file. Every ten destinations account for 1KB of file size. So if you don't need them, don't use them. That will help PDF to shrink.
Use the PDF Optimizer: By using this option in Acrobat you can find out which elements in your PDF (eg.fonts or images) are consuming the most space and you can make changes accordingly.
Manage your graphics: Use vector-based graphics whenever possible. Vector-based graphics scale perfectly, look better and take up less space than their GIF counterparts.
Manage your colours and minimize fonts.