Stray whitespace, runs of spaces, fully empty rows, duplicate rows, inconsistent case in a column, and find & replace in one or all columns.

How do I know what changed?

The result reports exactly how many cells were modified and how many rows were removed, with a preview before you export.

Never — cleaning runs in a background thread on your device.

Data Cleaner — Fix Messy CSV & Excel Files

Trim whitespace, drop duplicate and empty rows, normalize case and find & replace per column — with an honest changed-cell count. Free, private.