Matrixify

Excellent App, we have 3000+ products (books) in our shop and use it to catalogue new books in Excel, then upload them with Matrixify. Couldn't manage bulk updates without it. It's also great for setting up automated exports e.g. a daily inventory report. It can access product data that is not available in the standard Shopify bulk download. Very easy to export, open the file in Excel, make a few changes, then re-import. If you're comfortable working with spreadsheets and have a lot of data, this is the app you need.