How to archive all notes

If you enable Google Drive sync, all of your scratchpad notes should automatically transfer. In Chrome Settings → Extensions → Scratchpad → Options → Enable syncing to Google Docs.

You can also download your notes as plain text files either online or as a .zip file.

note: this worked for me as of May 20, but I could not replicate this on June 8th- the feature may have been disabled

If you press Ctrl+A, it will select all of the individual notes with its own interface. On the top, the yellow horizontal bar will become dark grey. The rightmost button of the center grouping is three vertical dots. If you click that, there's an option to Copy to Google Doc. Click that and there's a little dialog box that will soon give you a link that says "OPEN DOC," which will take you to your new "Google Keep Document" on Google Drive. If you have a lot of notes, it will take a long time to load it all, but then you can copy and paste that as plaintext or use Google Docs' built-in export options for Microsoft Word.

(Personally, I wish there was a way to keep them separated in this document, or to export them each as individual notes, but that's not possible at the moment, as far as I can tell. This would be useful for actually exporting to other notetaking apps and keeping the data fully intact. Unfortunately, Google Takeout still doesn't support it, but I imagine that will be the way to save the notes individually eventually.)