Japanese, Korean and Chinese language users will remain at 140 characters, since their alphabets allow people to say more in fewer characters, so there is less of a problem with the existing limit.
Despite Twitter’s defence of the move, it is likely to spark criticism from its users, who are famously sceptical of change, and many of whom will worry about giving Donald Trump twice as much space to vent.
Users have also criticised several other Twitter changes in recent years, including a non-chronological timeline, new ways of replying to tweets, replacing stars with hearts, circular profile photos, and a new font.
Twitter’s previous limit was set in the days when users were expected to send and read tweets via text message. Texts ran to 160 characters, so Twitter set it at 140 to leave room for a username.