Free tools
Each one does a single job, needs no account, and runs entirely in your browser — nothing you paste or drop is ever uploaded. We build these because we build OneShelf, and the same maths sits behind both.
Download a template that imports cleanly, or paste your own CSV and see exactly what Shopify will reject — a misspelled header, a bad handle, an inventory policy it does not accept.
Open the CSV tool →Build every variant SKU from one pattern, see collisions before they bite, and export the result as a Shopify product CSV.
Open the SKU generator →More are coming: a reorder-point calculator, a bundle stock calculator, and a check that tells you honestly whether a simple sync app is enough for your store.
Shopify counts stock per listing. When ten listings sell one real item — one blank tee behind many designs, one bottle in several sizes, one week of capacity across colours — Shopify still holds ten separate numbers. Nothing keeps them together, so two orders a minute apart can each take the last one. OneShelf gives those listings one base stock, and every sale deducts from that single number, online and at the register.
Install on Shopify See how it works
OneShelf is on the Shopify App Store. It is free up to 10 linked listings.