About csvToExcel

Opening a CSV in Excel quietly changes it: 00501 becomes 501, a 19-digit order ID becomes 1.84930275123457E+18 and loses its last digits, MARCH1 and 1-2 become dates, 2E5 becomes 200000. Drop the CSV here and every column is typed once from all its values: codes with leading zeros, IDs over 15 digits, phone numbers and part codes stay text exactly as written; plain numbers become numbers; ISO dates and date-times become date cells. Each column says why, what Excel would have done to it, and lets you change the type. Download an .xlsx that opens the same everywhere. Runs in your browser.

Runs entirely in your browser: your SQL and files are not uploaded. Signed-in members can keep a history of runs and results.

Built on open-source libraries: Papa Parse, fflate.