PDFs for web viewing need not be ready for offset printing. JPEG2000 is slightly more efficient than JPEG compression.įigure 6: Optimizing Image Settings Dialog Downsampling to lower resolutions If you use Acrobat 6 compatibility mode or higher you can use JPEG2000 instead of JPEG compression. Choose JBIG2 compression for monochrome images (supported in Acrobat 5 or higher) and lossy compression (see Figure 6). Choose JPEG compression for smooth-toned color images and ZIP for flat-color images that would normally be compressed as a GIF or PNG. For web use you only need 72 dpi for color images, and 150 dpi is a good compromise for monochrome images. The Image Settings panel lets you downsample images to lower image resolution. The first option in the PDF Optimizer settings panel is Images.
#Reduce pdf size adobe acrobat dc pro
Figure 3: Selecting PDF Optimizer in Advanced Menu of Acrobat 8 Pro Figure 4: Selecting Audit Space Usage in PDF Optimizerįigure 5: Audit Space Usage of Chapter 2 of Speed Up Your Site Optimize Images In our case fonts take up the most space, with content streams (text), and document overhead next in percentage of total file size. Concentrate your efforts on the largest areas. This dialog shows which components of your PDF are taking up the most space, in bytes for each element and the percentage of total file size (see Figure 5).
In Acrobat 8 Professional choose Advanced -> PDF Optimizer and click on the Audit Space Usage button (see Figure 4). The next step when optimizing PDFs is to audit the size of the different components that make up your PDF. Note that our test PDF (Chapter 2 of Speed Up Your Site , and 2opt.pdf ) is in version 1.3 from Acrobat 4. You can strip, flatten, downsample resolutions, and remove features from your PDF to minimize its file size. Acrobat 8’s PDF Optimizer ( Advanced -> PDF Optimizer) is an improved version of Acrobat 7’s PDF Optimizer – both of which are interfaces into Distiller’s settings (see Figure 3).
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