: For manual assembly and clean formatting, lightweight editors like TextEdit or Notepad++ are reliable for managing and merging plain text or code.

: You can export an entire conversation as a PDF using tools like Decipher TextMessage . This is useful for saving long threads as a single, searchable document.

Are you looking to from your phone, or are you drafting a new document from several different sources? Google Docs: Online Document & PDF Editor

: Apps like Print Text Messages on the Google Play Store allow you to back up and export messages directly to a file for printing or cloud storage.

If you need to get messages off your phone and into a single text file:

: You can use "Custom Building Blocks" in Google Docs to save frequently used text sections (like bios or signatures) and insert them into a new document by simply typing "@".

: For a more seamless desktop experience, Intel Unison can connect your phone to your PC to transfer files and manage messages directly from your computer. Putting a Text Together (Combining Files)

: This utility is specifically built to combine multiple text files into one large document instantly. It is particularly popular with screenwriters and writers working in Markdown.