If you've encountered a CSV file and you're unsure what they're for, the good news is they're pretty straightforward and easy-to-use with apps you already know.

Back up emails with a CSV file If you want to back up your emails so that you have a readable file that you can open in Excel if needed, you can create a CSV file instead.

Start by exporting your subscriptions using Google Takeout to create a CSV file. Then, install the extension, copy URLs from the CSV, and import up to 50 channels at once.