If being faced with a situation where a Swedish word has to be written without the Swedish letters, such as when writing names in broken forms online (I have on

If being faced with a situation where a Swedish word has to be written without the Swedish letters, such as when writing names in broken forms online (I have on of those letters in my name, and forms that tells me to "only use alphabetic letters" are annoyingly common), then either people simply use the letter without the dots, or they use formal transliteration. The formal way (which is what is done for the international part of a passport for example) is å to aa, ä to ae, ö to oe.