Upload your file

CSV, XLSX, or XLS. Parsing and validation happen in a dedicated browser worker; the file is never uploaded.

Drop your CSV or Excel fileor choose from this device · CSV 25 MiB · XLSX 10 MiB · XLS 5 MiB.csv.xlsx.xls

No file content is sent to ImportReady

Real spreadsheet parsing

CSV uses bounded streaming; Excel opens one worksheet within explicit local safety budgets.

Mappings and recent-file metadata can persist locally; spreadsheet cells do not.

The cap is shown before export, with your original always available.