CSV to Excel File Converter

Convert CSV to a downloadable Excel file, live preview, entirely in your browser.

Runs in your browser, nothing sent

csv-to-excel-file-convertoryour input stays here

CSV

name	role	team
Ada	Engineer	Platform
Grace	Engineer	Platform

Downloads as a classic .xls file (an HTML table Excel and Google Sheets both open directly) rather than a binary .xlsx — this avoids depending on a spreadsheet-writing library entirely, which keeps this tool free of a real, currently-unpatched vulnerability in the most common one. Runs entirely in your browser; nothing is uploaded anywhere.

Need the opposite? CSV to JSON Converter

What is CSV to Excel File Converter?

Paste CSV and download it as a spreadsheet file that opens directly in Excel or Google Sheets. Downloads as a classic .xls file (an HTML table with a spreadsheet MIME type, which every major spreadsheet program opens natively) rather than a binary .xlsx, specifically to avoid depending on a spreadsheet-writing library. The most common one has unpatched security advisories.

How to Use the CSV to Excel Converter

1
Paste the CSV: Enter standard comma-separated CSV data.
2
Preview the Table: Check the live preview to confirm rows and columns look correct.
3
Download the Spreadsheet File: Click download to save a file that opens directly in Excel, Google Sheets, or Numbers.

How CSV Maps to the Downloaded Spreadsheet

The CSV is parsed into rows and cells, then rebuilt as an HTML `<table>` (one `<tr>` per CSV row and one `<td>` per cell) served with a spreadsheet MIME type and an .xls extension. Excel, Google Sheets, and Numbers all recognize that combination and open the table as a normal spreadsheet grid, with the first row landing in row 1 and so on, exactly matching the CSV's original row and column order.

Example

OUTPUT

CSV input:
name,role,city
Alice,Engineer,Boston
Bob,Designer,"Austin, TX"
Carol,PM,Denver

The downloaded file opens with 4 rows and 3 columns: a header row (name, role, city) followed by one spreadsheet row per CSV row, each cell landing in its own column. Bob's "Austin, TX" stays in a single cell rather than splitting at the comma, since it was a properly quoted CSV field to begin with.

FAQs

Frequently Asked Questions

Common questions about CSV to Excel File Converter.

Producing a real .xlsx file needs a binary spreadsheet-writing library, and the most widely used one (SheetJS/xlsx) currently has unpatched high-severity vulnerabilities with no fixed version published to npm. The .xls-via-HTML-table approach is a long-standing, well-supported trick that needs no such library and opens identically in Excel, Google Sheets, and Numbers.

No, the file is generated and downloaded entirely in your browser.

Yes, Google Sheets, like Excel and Apple Numbers, recognizes an HTML table served with a spreadsheet MIME type and .xls extension, and opens it as a normal spreadsheet grid.

Yes, Bytelify's CSV to Excel File Converter is free with no account or sign-up required.