File Extension SIZED File Format Gallery resized photo image SIZED stands for Gallery resized photo image. 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 Skyla puts scanning in the frame Sexting app could have a use for tech firms What is art folder in gallery?