First go to Google Takeout and download your hangouts data. Extract the Hangouts.json file from the zip and upload it here. Browse

Now choose what format you'd like it in. The dropdown box gives more information about the file types.
Simplified JSON JSON array of conversation objects and each conversation contains an array of participants and an array of message objects. Each message object has a sender, time and content attribute.
Plain Text A plain .txt file with the sender, time, date and content with one message's attributes per line.
Comma Separated Value A .csv file with the sender, time, date and content separated with commas. One message is printed per line.
HTML A HTML file with the messages styled like the hangouts interface you're used to.

Download All (Chrome doesn't allow too many downloads, use Firefox if you have a lot of chats)

{{file.name+file.type}}