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Merge Etsy and eBay Sales Data for Refund Reconciliation

Refunds are recorded differently enough between platforms that matching them back to original orders is one of the most error-prone manual tasks.

Why Etsy and eBay exports don't line up

Etsy: Sale Date, usually already in your local timezone; Item Total, Shipping, and Etsy fees as separate columns, before tax; a numeric Order ID shared by every item in the same order. Also, listing titles are included in full and often contain commas, which can shift columns if opened carelessly in Excel.
eBay: Sale Date shown in the seller's local time; item subtotal, shipping, and final value fee as separate columns; an Order Number that can bundle multiple items bought together into one row. Also, the seller hub export format changed more than once, so column names can differ depending on when the report was generated.

For refund reconciliation, 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 Etsy export and map its columns once.
Drop in your eBay 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.