Convert csv to dds Online: csv2dds

You can use Tom's Editor to easily convert images from
Comma-Separated Value .CSV to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

CSV

CSV are simple text files used mainly to store tables (as in Microsoft Excel). Saving images as CSV means converting to grayscale and storing every pixel in a different cell of a table.

DDS

DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.