FLIF was first announced in 2015, and the first stable version (named FLIF16) was released in 2016. Note that FLIF files or software created before about 2016-08 are likely to be incompatible with the current FLIF format.
FLIF files begin with ASCII "
The byte at offset 4 is one of the characters from the ASCII string "
The byte at offset 5 is one of the characters from the ASCII string "
- https://github.com/sveinbjornt/Phew/tree/master/sample-images → *.flif
- https://github.com/SaschaNaz/libflif.js/tree/master/sample → *.flif