Convert flif to raw Online: flif2raw
You can use Tom's Editor to easily convert images from
Free Lossless Image Format .FLIF to RAW Dump
Tom's Editor is a free, online image manipulation and converter program.
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Free Lossless Image Format is an image format with extension FLIF.
This is just raw pixels saved in a file. Format used mostly by old games. RAW files do not have any header so if you don't know what is the original width and height of the image it might be hard to decode them.