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Merge Shopify and Depop Sales Data for Cost of Goods Sold Tracking

Calculating cost of goods sold across channels requires item-level data lined up the same way regardless of where it sold.

Why Shopify and Depop exports don't line up

Shopify: a Created At timestamp that includes a timezone offset; a single Total column that already nets out discounts, with tax broken out separately; an order Name like #1001 rather than a numeric ID. Also, exports one row per line item by default, so an order with 3 products becomes 3 rows unless you export the summary report instead.
Depop: a transaction date column; item price and Depop's payment processing fee as separate lines; a transaction ID rather than a traditional order number. Also, like Poshmark, the export is minimal and mixes sold, refunded, and offer-related rows together.

For cost of goods sold tracking, that mismatch is exactly what causes hours of manual cleanup every period.

Open CSV Experts and set your target columns once (Date, Channel, Order ID, Total).
Drop in your Shopify export and map its columns once.
Drop in your Depop export and map it the same way — both merge into one sheet, normalized.
Export as CSV or Excel. Same-layout files merge automatically next time.

No. Everything runs in your browser using JavaScript — your files are never sent to a server.

Yes. Add as many source files as you want; each distinct file layout is mapped once and remembered.