CSV to XLSX
Parse CSV into a genuine XLSX workbook.
Local processing · Nothing is uploaded · 10 MB per file / 25 MB total
Input & settings
No files selected
Result
How to use
Choose the source file, review settings, process, then inspect and download the result.
Limits and behavior
RFC-style quoted fields are supported. Values remain text so leading zeros and formula-like strings are preserved safely. Local processing. Maximum 10 MB per file, 25 MB total; expanded ZIP contents at most 50 MB and 2,000 entries. Spreadsheet limit: 10,000 cells and 2,000 rows per sheet. Macros are never executed. Originals are unchanged. Cancellation stops active PDF renders and discards stale results; a synchronous library step finishes before the browser can handle cancellation.
Turn CSV spreadsheet data into Excel format
Parse CSV with supported quoted fields and write the resulting rows into an actual XLSX worksheet.
Does CSV to XLSX recreate charts or original Excel formulas?
No. CSV stores tabular values without workbook formatting, charts or formulas to restore.
Related tools: xlsx to csv · json to xlsx