Compare two CSV files and see which rows were added, removed or changed, with every changed cell highlighted. Everything runs in this browser window: your files are never uploaded anywhere (this page is blocked from using the network).
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Row numbers are positions in your files (the header is row 1). Changed cells show the old value above the new one. The download lists every difference: a changed row appears twice, as "changed-before" (old values) and "changed-after" (new values), and the changed_columns column names the cells that differ. Columns that exist in only one file are listed above and are not compared.