Clean a spreadsheet, get a dashboard

Drop in a file. It gets profiled for duplicates, missing values, mixed formats and inconsistent labels, then charted according to what the columns actually are.

Drop a file here, or

.csv .txt .tsv .tab .xlsx .xlsm .xlsb .xls .json .ndjson .jsonl .parquet .pqt

Files are read and queried entirely in this browser tab. Nothing is uploaded to a server, which is also why a large file stays fast.