How to Convert CSV to Excel (Add Formatting, Formulas, and Charts)

CSV is raw data. Excel turns it into something useful — with formatting, formulas, charts, and multiple sheets. Upload to MegaConvert.io and select XLSX — done in seconds, free.

The Problem

You exported data from a database, API, or tool and got a .csv file. It opens in Excel but everything's in one column, or the encoding is wrong, or you just want proper formatting. Converting properly preserves your column structure.

Why Convert?

• Formatting — CSV is plain text. Excel supports fonts, colors, cell formatting, and conditional formatting.
• Formulas — add SUM, VLOOKUP, pivot tables, and charts.
• Multiple sheets — CSV is single-sheet. Excel organizes data across tabs.
• Sharing — .xlsx is the business standard. Not everyone knows CSV.

How to Convert Online

1. Go to megaconvert.io/csv-to-xlsx.
2. Drag and drop your .csv file.
3. Download your .xlsx.

No account. No watermarks. Files auto-delete after 1 hour.

Related Conversions

• Excel to CSV — export to plain text.
• JSON to CSV — API data to spreadsheet.
• CSV to JSON — spreadsheet to API.
• XLS to XLSX — upgrade old format.

For Developers: API

curl -X POST https://megaconvert.io/api/v1/convert/sync \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "file=@input.csv" \
  -F "output_format=xlsx" \
  -o output.xlsx

API docs → | SDKs →