Stop spreadsheet programs from truncating leading zeros in US ZIP codes, telephone numbers, and inventory SKUs. Convert CSV records into XLSX while keeping strings intact.
Load CSV Document
Choose your CSV file containing zero-prefixed numbers.
Verify in Table Preview
Inspect the leading columns to verify the zeros remain intact.
Download XLSX Workbook
Save the output as an XLSX spreadsheet or UTF-8 BOM CSV.
Values such as 5-digit ZIP codes (e.g., 01234) or serial codes are preserved as text strings rather than converted into truncated integers.
Need to go the other way? You can also import multi-sheet XLSX or XLS workbooks, select any specific sheet, and export it as clean CSV.
Yes, both legacy .XLS and modern .XLSX spreadsheets can be imported to extract individual sheets to CSV.
Performance depends on your device memory, but standard business spreadsheets are processed smoothly.