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Join CSV without uploading

Left join two CSVs on a shared key in the browser. Unmatched catalog keys stay (empty right-side cells). Warehouse-only keys never appear. Files never leave the machine.

Open catalog.csv and warehouse.csv. Left join on SKU. Download one table with columns from each. No account. Offline once loaded.

  1. Open catalog.csv and warehouse.csv.
  2. Left join on SKU.
  3. Download one table with columns from each.

Example

catalog.csv
SKUProductPrice
SKU-1001Linen tea towel18.00
SKU-1002Stoneware mug14.00
warehouse.csv
SKUOn HandBin
SKU-100112A-1
SKU-100811B-8
Result
SKUProductPriceOn HandBin
SKU-1001Linen tea towel18.0012A-1
SKU-1002Stoneware mug14.00

After a left Join on SKU, SKU-1002 (Stoneware mug) still has a price and an empty On Hand, while warehouse-only SKU-1008 (11 in B-8) never appears.

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