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How to Fix Slow PDF Files
Acrobat’s Portable Document Format (PDF) is designed to create multi-purpose documents—documents designed for printing and for displaying on computers. An inherent problem in this approach to rendering PDFs is that documents designed for printing require images with much higher resolutions than documents designed for display on computer monitors. High-resolution images in PDFs create large files, often making downloading them from the Internet and navigating them in Acrobat Reader slow and cumbersome. You can fix large, slow PDFs with Acrobat Pro’s PDF Optimizer.
Open the slow PDF in Acrobat Pro. Click “File” on the menu bar and choose “Open.” This displays the Open dialog box. Navigate to the file, select it and then click “Open.”
Click “Advanced” on the menu bar and choose “PDF Optimizer." This opens the PDF Optimizer dialog box.
Click the “Audit space usage” button to open the Audit Space Usage dialog box. This is an informational dialog box. It displays the overall size (in bytes) of the elements making up the PDF and the percentage of the file size each type of element uses. For example, notice that “Images” takes up the largest percentage of the file, sometimes up to 80 percent or more of the overall PDF size. Click “OK” to close the dialog box.
Examine the “Color Images” portion of the “Image Settings” section (the first section) of the PDF Optimizer dialog box. Notice the field next to the “Downsample” drop-down. This is the resolution of the color images in your PDF, measured in dots per inch (DPI). Computer monitors can display only 72 DPI or 96 DPI on High Definition (HD) monitors. If the value in the Resolution field is higher than 72 (or 96 for HD displays), change this number to optimize the images for display on computers. You can also make the images smaller by adjusting the compress quality (the “Quality” drop-down). Be careful though, setting this drop-down to a setting lower than “Medium” can greatly degrade your image quality.
Examine the “Grayscale Images” portion of the “Image Settings” section (the second section) of the PDF Optimizer dialog box. Notice the field next to the “Downsample” drop-down. This is the resolution of the grayscale images in your PDF. If the value in the Resolution field is higher than 72 (or 96 for HD displays), change this number to optimize the images for display on computers. You can also make the images smaller by adjusting the compress quality (the “Quality” drop-down). Setting this drop-down to a setting lower than “Medium” can also degrade your image quality.
Examine the “Monochrome Images” portion of the “Image Settings” section (the third section) of the PDF Optimizer dialog box. Notice the field next to the “Downsample” drop-down. This is the resolution of the monochrome images in your PDF. If the value in the Resolution field is higher than 72 (or 96 for HD displays), change this number to optimize the images for display on computers.
Click “OK” to apply the settings. Acrobat Pro displays the “Save Optimized As” dialog box. This is a safeguard, so that you don’t inadvertently save over the original print-quality PDF. Rename the file in the “File name” field and click “Save.” You now have a PDF optimized for the Internet.
Tips
InDesign and some other high-end design programs have an export setting for optimizing PDFs. In InDesign, for example, you would choose “Smallest File Size” from the export options during the PDF export process.
Warnings
Optimizing PDFs for the Internet sometimes involves a trade-off between quality and file size. If, for example, your PDF users will download and print the document, setting image quality to 72 DPI can cause poor print quality, especially for monochrome images. You should set your DPI between the optimal print quality setting ( DPI) and the optimal display quality (72 DPI). Set color and grayscale images to about DPI and monochrome images to DPI. (Monochrome images are not very big, anyway.)
References
Writer Bio
A writer for more than 20 years, William Harrel has authored 19 books, including two titles in the "For Dummies" series. He has also contributed articles to magazines such as "Computer Shopper," "PC World," "Home Office Computing," "Windows Magazine," "MacWorld," "Compute!" and many others.
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