Mar 09

Depending on what program you used to create a PDF, the file size of your PDF file can be quite large. If you combine two or three PDF files together using preview, you can also end up with a bloated PDF file.  The best way to reduce PDF file size is with Acrobat professional, which can do all sorts of magic on PDF files. But here is a free  way to make a PDF file smaller. Firstly, open the PDF file in ColorSync utility. The ColorSync utility is found in the utility folder of the applications folder of your computer. If you don’t know how to find that, simply right click ( or option click if you have a one button mouse) on the PDF file, and select from the menu open with,  ColorSync utility.

This will open your PDF file in colour sync utility. Go down to the bottom of the window to the drop-down menu on the left that says ‘Filters’  and select ‘reduce File Size’.  then click the button in the bottom right  of the window that says apply.

Select the filter that says reduce file size

This will go through and re-compress the images in your PDF to make the file size smaller.  Don’t forget to save the file after you’re finished,  you may want to use ‘save as’  so that you still keep the original copy of your PDF file.

If you want to be able to change the quality of the file that is saved, check out this great article from macworld:

51 Responses to “How to reduce the size of a pdf document in OS X”

  1. C. Hawkins says:

    Easy Fix! Reduced my 90.1 MB PDF to 800 KB. Thanks a bunch!

  2. Matt says:

    Also have a look at – it’s a great little tool that does good compression but maintains the quality.

    • Eyrekr says:

      This website works for me!My file size reduced from 5.6MB to 1.1MB. However, I don’t know the reason why my file size doesn’t change after using Colorsync… Thanks anyway!! :)

  3. Biraj Naidoo says:

    Thanks for the great tip! Much appreciated.

  4. Mary Ann says:

    This information helped me immensely. Every file comes in as number 1. Is there a way to change that?

  5. Carol Bartles says:

    This recommendation is incredible. Thank you, Thank you so much.

  6. Lama says:

    Great tip! this worked reduced my file from 7.8M to 1.1MB! So helpful

  7. Diane says:

    Thanks SO much!!!

  8. Jessica says:

    AMAZING! They’re a bit grainy but it worked. I needed to upload copies of my transcripts for a job posting, but the PDFs were too big. I’m a wiz with the fancier versions of Adobe you see in offices, but this was so helpful!

  9. Brook says:

    Awesome! My printer wouldn’t print my 4.5 mb pdf file but I was able to reduce it to 200 kb and it printed just fine! Thanks a lot.

  10. may says:

    Amazing! Thanks a bunch!
    Just a note that if you had anything highlighted on the PDF through Preview, they disappear after the file reduction!!

  11. anne says:

    Worked for me, thanks so much!!

  12. SK says:

    I needed to compress my file for a resume upload and this took my pdf from 3.3 MB to 410 KB. Thank you, thank you!

  13. Rod says:

    So how do you remove pages from a PDF? Sometimes I get manuals that are for several different versions of the same product. More often, I get manuals half of which are in Spanish, which I cannot read, and sometimes several different languages, only 2 of which I can read.

    I don’t want to waste the disk space and the extra time it takes to open a PDF that is at least twice as large as it needs to be.

  14. Fabio Buhr says:

    Thank you so much for this, very helpful and uses ready to use resources!

  15. Edgard Ade says:

    Original file: 315KB
    ‘Reduced’ file through ColorSync: 324KB.

    Not working for me on Yosemite.

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