Drop a CSV and get a data-quality report in this browser tab. Nothing is uploaded, nothing is stored — the file never leaves your machine. It tells you what will break your import before you import it.
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This page checks one CSV in your browser. CSV Doctor is the same checks as a command-line tool: reads xlsx and csv, walks a whole folder, reports encoding and header-row problems too, and exits non-zero so you can put it in front of an import job.
CSV Doctor — free download See all 11 tools