How to Convert CSV to Excel (.xlsx) Free Online
Opening a CSV directly in Excel often goes wrong — everything lands in one column, or numbers with leading zeros get mangled. Converting CSV to a proper Excel .xlsx file first avoids all of that. Here's how to convert CSV to Excel free, in your browser.
Convert CSV to Excel in one click
Open the CSV to Excel converter, choose your .csv file, and click Convert to Excel. Download a ready-to-open .xlsx workbook with every field in its own cell. It's generated entirely in your browser, so the file is never uploaded.
Why the columns break when you double-click a CSV
Double-clicking a CSV makes Excel guess the delimiter based on your regional settings — in many locales it expects semicolons, not commas, so a comma-separated file all crams into column A. Converting to .xlsx bakes the columns in, so it always opens correctly.
Keeping leading zeros and long numbers
Excel loves to turn "007" into "7" and long IDs into scientific notation. A proper .xlsx preserves your data as it was written far more reliably than a raw CSV re-parse. For critical ID columns, converting first is the safe move.
Works on any device
No Excel required to do the conversion — it runs in any modern browser on phone, tablet or desktop. You only need a spreadsheet app to open the finished .xlsx.
Related tools
Reverse it with Excel to CSV. Have JSON instead of CSV? Use JSON to Excel. Just need to read the data as text? Try CSV to JSON.