Save and Print Messages on your Android Phone.
Android Transfer Software - Droid Transfer is a Windows application which works alongside a free Transfer Companion app for Android, allowing you to transfer SMS and MMS Messages from your Android Phone to your PC via a USB cable or over your local WiFi network.
You can save your phone messages in a variety of file formats, including PDF, HTML or Text. Droid Transfer also saves any photos, emojis and videos in your messages, as well as dates and times they were received.
Alternatively, Print your Android Phone Messages directly from Droid Transfer running on your PC.
If you don't own a computer, Transfer Companion app will export your text messages to PDF, without needing to install any other software.