CSVLane is a free CSV workbench that runs entirely in your browser tab: files are never uploaded and there is no account.

Compare two CSV exports or Excel .xlsx workbooks by an ID column and see added, removed and changed rows cell by cell, even when one file has been re-sorted.

Clean a CSV: trim extra spaces, remove empty rows and duplicate rows (by the whole row or chosen columns), change the delimiter (comma, semicolon, tab, pipe), read encodings such as Windows-1252 or Shift_JIS, and download UTF-8 CSV with or without a BOM, or JSON.

I built it because row-by-row diff tools report false differences as soon as an export is re-sorted, and most CSV tools upload the file. Tested guides: https://csvlane.com/guides/