There are many reasons why you might want to download your Facebook Messenger Chat history: You may want to save a certain Messenger conversation or you just want to have a backup outside of Facebook. Maybe also you are one of the #deletefacebook people and are looking for a way to backup your data.
The good news is: Facebook now offers the option to download specific data only, as well as everything they have ever saved about you. That means you can select which type of information you want to download (messages, posts, pictures…) and which time frame this download should cover.
By the way: archived chats can now also be downloaded :)
Follow these steps to download and save your facebook messenger chat history: