Quick links to procedures on this page:

•
 
To set the bitmap compression in a PDF file
•
 
To compress text and line art in a PDF file
•
 
To downsample bitmap images in a PDF file

Reducing the size of PDF files

You can compress bitmap images, text, and line art to reduce the size of a PDF file. Options for bitmap image compression include JPEG, LZW, and ZIP. Bitmap images that use JPEG compression have a quality scale ranging from 2 (high quality, less compression) to 255 (lower quality, more compression). The higher the image quality, the larger the file size.

You can also reduce the size of a PDF file by downsampling color, grayscale, or monochrome bitmap images.

Using symbols in a drawing can help you reduce the file size of the PDF file when publishing to PDF. For more information, see Working with symbols.

To set the bitmap compression in a PDF file Back to Top
1
 
Click File Export.
2
 
Choose PDF - Adobe Portable Document Format from the Save as type list box.
3
 
Locate the folder in which you want to save the file.
4
 
Type a filename in the File name box.
5
 
Click Export.
The PDF settings dialog box appears.
6
 
Click the Objects tab.
7
 
Choose one of the following from the Compression type list box:
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None
•
LZW
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JPEG
•
ZIP
•
JP2
The JP2 (JPEG 2000) option is available only for Adobe Acrobat 6.0, Adobe Acrobat 8.0, and Adobe Acrobat 9.0
If you choose JPEG compression, you can specify the compression quality by moving the Quality factor slider.
To compress text and line art in a PDF file Back to Top
1
 
Click File Export.
2
 
Choose PDF - Adobe Portable Document Format from the Save as type list box.
3
 
Locate the folder in which you want to save the file.
4
 
Type a filename in the File name box.
5
 
Click Export.
The PDF settings dialog box appears.
6
 
Click the Objects tab.
7
 
Enable the Compress text and line art check box.
To downsample bitmap images in a PDF file Back to Top
1
 
Click File Export.
2
 
Choose PDF - Adobe Portable Document Format from the Save as type list box.
3
 
Locate the folder in which you want to save the file.
4
 
Type a filename in the File name box.
5
 
Click Export.
The PDF settings dialog box appears.
6
 
Click the Objects tab.
7
 
Enable any of the following check boxes, and type a value in the corresponding box:
•
Color
•
Grayscale
•
Monochrome
Downsampling color, grayscale, or monochrome bitmap images is effective only when the resolution of the bitmap image is higher than the resolution specified in the Bitmap downsampling area.
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