Convert CSV to XLSX

Free online CSV to XLSX converter.

Choose .csv files

or drag and drop — multiple files supported

Max 200 MB for video · 100 MB for other files

Related converters

CSV → JSONXLSX → CSVJSON → CSVJSON → YAMLYAML → JSONXML → JSONJSON → XMLMD → HTMLHTML → MD

Why convert CSV to XLSX?

CSV files are plain text — they don't support formatting, formulas, multiple sheets, or charts. Converting to XLSX gives you a proper Excel spreadsheet that you can format, sort, filter, and share professionally. Most business tools export CSV, but most people work in Excel.

Common use cases

  • Opening database exports in Excel
  • Formatting raw data for business reports
  • Sharing CSV data with non-technical colleagues
  • Importing CRM/analytics exports into spreadsheets

How to convert CSV to XLSX

  1. Click "Choose a .csv file" or drag and drop your CSV file into the upload area.
  2. Select your preferred quality level — high quality keeps the best fidelity, smaller file prioritizes file size.
  3. Your file uploads directly to our secure servers and conversion starts automatically.
  4. Once finished, click "Download" to save your converted XLSX file.

Tips for CSV to XLSX conversion

  • The first row of your CSV will be treated as column headers in the spreadsheet.
  • Large CSV files (100K+ rows) convert quickly since XLSX uses efficient binary storage.
  • After conversion, you can add formatting, formulas, and charts in Excel or Google Sheets.

About CSV and XLSX formats

.CSV format

CSV (Comma-Separated Values) is a plain text format for tabular data. Each line is a row, values separated by commas. Universally supported by spreadsheet applications, databases, and programming languages.

.XLSX format

XLSX is Microsoft Excel's modern spreadsheet format. It supports multiple sheets, formulas, formatting, charts, and large datasets. The standard for business spreadsheets.

Frequently asked questions

Will my data formatting be preserved?

CSV is plain text with no formatting. The XLSX output will have your data in clean rows and columns, ready for you to format. Numbers, dates, and text are auto-detected.

Can I convert a CSV with special characters?

Yes. We handle UTF-8 encoding, so accented characters, CJK text, and emoji all convert correctly.

Convert CSV to other formats

CSV to JSON

Privacy and security

Your files are encrypted during upload using 256-bit SSL and are automatically deleted from our servers within 24 hours. We never share, sell, or access your files. All conversions happen on isolated, ephemeral servers.