![]() You can also compress vector image data using ZIP compression, which is built into the PDF format. Vector images scale perfectly, look marvelous, and their mathematical formulas usually take up less space than bitmapped graphics that describe every pixel (although there are some cases where bitmap graphics are actually smaller than vector graphics). ![]() Use vector-based graphics wherever possible for images that would normally be made into GIFs. Be sure to turn off thumbnails when saving PDFs for the Web. Use black and white images and text instead of color images to allow the use of the newer JBIG2 standard that excels in monochromatic compression. Inserting compressed JPEGs into PDFs and Distilling them may recompress JPEGs, which can create noticeable artifacts. Use the best quality images that you can at the output resolution of the PDF. Avoid Poor Quality Graphics For graphics that must be inserted as bitmaps, prepare them for maximum compressibility and minimum dimensions. However you create a PDF, the techniques and tools listed below can help you enhance and optimize your PDFs for the Web. There are different methods to create PDFs, including outputting to PostScript and Distilling, GDI/Printing, one-click “Direct to PDF,” and dynamically on the server-side. Minimize the number and complexity of forms in your PDF document, and avoid the use of multimedia. To create the smallest possible PDFs file size for the Web minimize the number of fonts, bitmapped images, and substitute vector based-graphics instead. At the time of this writing, Adobe says that of those 90%, 50% use version 5 and 40% use version 6. Acrobat will usually display (with a warning) a more recent PDF version, but new compression schemes will spawn an error when opened in older versions of Acrobat. However, since over 90% of Acrobat users have version 5.0 or greater, using PDF 1.4 is a safer alternative. JBIG2 also compresses the entire table.Īcrobat 6 (PDF version 1.5) added the ability to compress the entire file (Clean Up Settings dialog). Like other dictionary-based algorithms (LZW, ZIP) JBIG2 creates a table of unique symbols and when a subsequent symbol matches one in the table, it substitutes a token pointing to the table index. ![]() JBIG2 (Joint Bilevel Image Experts Group) encoding compresses monochrome (1 bit per pixel) image data from 20:1 to 50:1 for pages full of text. Acrobat 5 (PDF version 1.4) added JBIG2 compression, which is superior to the CCITT or Zip algorithms when compressing scanned monochromatic copy. In general the higher the PDF version number, the smaller the file. Optimizing PDF files for the Web can significantly shrink their size and boost display speed, saving bandwidth and user frustration.Ĭreating Small PDFs The main factors in creating small PDFs are image resolution, image type (bitmap or vector), the number of fonts used and how they are embedded, PDF version, and the level of compression. Even PDFs designed for Web use can have a wait problem, weighed down with excess fonts, change histories, and unoptimized images and forms. What’s the best way to optimize your PDFs for blogs and websites? While PDFs have become quite popular on the Web, many PDFs used in web sites are designed for high quality print output and are not optimized for the Web. in /home/iawalsh1/public_html/technical-writing/wp-includes/functions.php on line 3896 Notice: get_currentuserinfo is deprecated since version 4.5.0! Use wp_get_current_user() instead. Deprecated: Function get_magic_quotes_gpc() is deprecated in /home/iawalsh1/public_html/technical-writing/wp-includes/formatting.php on line 4387ĭeprecated: Function get_magic_quotes_gpc() is deprecated in /home/iawalsh1/public_html/technical-writing/wp-includes/formatting.php on line 2448
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