Export CSV files as Excel (XLSX/XLS) format
Convert any CSV file into a properly formatted Excel workbook (.xlsx) right in your browser. The converter preserves your data structure, applies basic column typing, and produces a file that opens cleanly in Excel, Google Sheets, or LibreOffice.
Initializing in your browser…
A non-technical stakeholder needs the data as a real .xlsx with the numbers actually formatted as numbers, not text.
Input
report.csv (12 columns)
Output
report.xlsx, typed cells, frozen header row, auto-fitted columns
A native XLSX is generated with proper cell types so Excel sums and sorts work immediately, avoiding the "numbers stored as text" warning that a plain CSV rename produces. Generation is in-browser, so confidential figures are not uploaded.
Convert any CSV file into a properly formatted Excel workbook (.xlsx) right in your browser. The converter preserves your data structure, applies basic column typing, and produces a file that opens cleanly in Excel, Google Sheets, or LibreOffice.
Turn raw CSV exports into polished Excel files that business users can open without confusion.
Avoid the common problem of Excel misinterpreting CSV values (like zip codes losing leading zeros) by setting types during conversion.
Merge multiple CSV files into separate sheets within a single Excel workbook.
Unlike a simple rename from .csv to .xlsx, this tool creates a genuine Office Open XML workbook. Numeric columns stay as numbers, date-like strings get date formatting, and column widths auto-adjust to content. You can also go the other direction, drop in an .xlsx and get a clean CSV back.
Yes, columns detected as identifiers retain leading zeros. You can also manually set a column to text type before converting.
Yes. The tool supports both directions. Upload an .xlsx file and download a standard CSV.
Rows and columns are parsed and transformed in memory in your browser. No record ever reaches a server.