File Extension PX1 File Format Image Pixel Paint PX1 stands for Image Pixel Paint. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Video: HTC Titan II unveiled at CES 2012 - Titanic or Clash of the... ? IPhone: Having a font size issue Will a HD Radeon 6870 work with my currents pc setup?