Ricardo Ferreira (who sent us quite a few tips before) wrote a nice Nautilus script which comes with a GUI (Zenity) to compress and optimize PDF files called Compress PDF.
The script currently comes in multiple languages: English, Spanish*, French*, Czech* and Portuguese (but you can translate it into your language if you want - there are only 10 short lines to translate) and you can choose between 5 different compression levels: Screen-view only, Low Quality, Hight Quality, High Quality (Color Preserving) and Default:
As an example: compressing a PDF using the "Default" preset, the file size was reducced from 4,6mb to 3,3mb with no visible quality lost.
To "install" this Nautilus script, simply paste this in a terminal:
sudo apt-get install zenity ghostscript mkdir -p ~/.gnome2/nautilus-scripts cd ~/.gnome2/nautilus-scripts rm "Compress PDF" #in case you're using an older version wget http://launchpad.net/compress-pdf/1.x/1.4/+download/Compress-PDF-1.4.tar.gz tar zxvf Compress-PDF-1.4.tar.gz && rm Compress-PDF-1.4.tar.gz
Then to use it, simply right click on a PDF file and select "Compress-PDF" from the "Scripts" menu:
Credits for this script (and many thanks!): Ricardo Ferreira
*Spanish translation by Eduardo Battaglia
*French translation by astromb
*Czech translation by clever fox
Many thanks to all who translate the script!