Convert csv to flif Online: csv2flif

You can use Tom's Editor to easily convert images from
Comma-Separated Value .CSV to Free Lossless Image Format .FLIF.
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.

FLIF

Free Lossless Image Format is an image format with extension FLIF.