What's with flag resolutions

[PaperAviator]

It seems that everyone says that flags in KSP are 256x160, but in my flags folder the flags are all stretched out and have a resolution of 512x256, and the game will only accept flags of that resolution. Is this normal? how can I make custom flags with correct proportions?

[VoidSquid]

Please don't take this for a definite answer, but as per my understanding, earlier we had a max res of 256x160 (which still works for me), at some point double of that became the default.

For my custom flag, I took a larger image, cropped it to 512x256, and saved it as PNG.

[Kerbal Productions]

The game made 256x160 as its main res for flags, and you can't argue with that fact. So, try resizing it online. It might work.