Excel ↔ CSV - Convert Excel CSV Online

Convert between Excel and CSV online

Upload {mode === "excel-csv" ? "Excel" : "CSV"}

Click to select file {mode === "excel-csv" ? "Excel (.xlsx, .xls)" : "CSV (.csv)"}

Result

Select fileand press "Convert"

Excel CSV Converter Online Free - Convert Excel to CSV for Free

The free online Excel CSV Converter tool helps convert Excel to CSV and CSV to Excel for free and quickly. Fully supports .xlsx, .xls, .csv file formats with full browser processing capabilities using SheetJS library - a trusted industry standard. Do not upload files to the server, ensuring absolute security for your sensitive data. Keep 100% of data intact and UTF-8 encoding for accented Vietnamese. Download the resulting file immediately after conversion. Simple interface, easy to use, no need to log in or install software. Works on all devices: computer, tablet, phone.

Outstanding features

Convert Excel (.xlsx, .xls) to CSV quickly and accurately
Convert CSV to Excel (.xlsx) with standard format
Processed entirely in the browser - no file uploads to the server
Use SheetJS library - a trusted industry standard library
Maintain 100% data and UTF-8 encoding for Vietnamese
Supports Vietnamese with full accents, no font errors
Download the resulting file immediately after converting
Supports files with multiple sheets (automatically takes the first sheet)
Unlimited file size - handle large files easily
No login required, completely free and unlimited
Simple, intuitive interface, easy to use for everyone
Responsive design - works well on all devices

Why is it necessary to convert between Excel and CSV? Practical applications

Excel (.xlsx) and CSV are the two most popular formats for spreadsheet data, each with its own advantages suitable for different uses. CSV (Comma-Separated Values) is a pure text file, lightweight, easy to import into databases (MySQL, PostgreSQL, MongoDB), compatible with all systems and programming languages, easy to read and process with code. Excel has more features like formatting (colors, fonts, borders), formulas for automatic calculations, visual charts and graphs, multiple sheets in one file, data validation and comments. You need to convert Excel → CSV when: Importing data into a database or backend system, uploading to platforms that only accept CSV (Google Ads, Facebook Ads, Mailchimp), sharing data with systems on other platforms, reducing file size for emailing or storing. You need to convert CSV → Excel when: Need to format and present data beautifully for reports, need to use formulas for calculations and analysis, need to create charts and visualizations from data, share with colleagues or customers using Excel.

Benefits when used

  • •Save time - convert right in the browser, no need to install software
  • •Absolute security - files are not uploaded to the server, processed 100% offline
  • •Completely free - unlimited uses, no ads
  • •Simple and fast - just a few clicks and you're done
  • •UTF-8 support is perfect - Vietnamese has accents displayed 100% correctly
  • •Cross-platform - works on Windows, Mac, Linux, mobile
  • •No need to register an account - use immediately
  • •Keeps the data structure intact - no information is lost when converting

Detailed instructions on how to convert Excel CSV online

  1. 1Select conversion mode: click
  2. 2or
  3. 3depending on needs
  4. 4Click on the upload area to open the file selection window from your computer
  5. 5Select the file to convert (.xlsx, .xls for Excel or .csv)
  6. 6Press the
  7. 7button and wait a few seconds for
  8. 8to process When finished, click the
  9. 9button to download the results
  10. 10The file will be downloaded with the corresponding name (.csv or .xlsx)
  11. 11Open the resulting file to check the converted data is correct

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