Convert XLSX to CSV Online – Free Excel to CSV Converter

Excel to CSV Converter – XLSX / XLS to CSV
Upload an Excel file (.xlsx or .xls), preview the data, and convert it to clean CSV format.
No file uploaded yet. Upload an Excel file to preview its content here.
✅ CSV ready – copy or download below
CSV Output – Copy or Download
Clean, comma‑separated values generated from your Excel file. Perfect for databases, APIs, and data tools.

Convert XLSX to CSV online in seconds – completely free, no signup. This browser‑based tool turns any Excel spreadsheet (.xlsx or .xls) into a clean, comma‑separated values (CSV) file. Perfect for database imports, API data preparation, migrating data to analytics tools, or simplifying spreadsheets for further processing.

Why convert Excel to CSV?

  • Export Excel data for use in databases (MySQL, PostgreSQL, etc.)
  • Prepare spreadsheet data for CSV‑friendly analytics tools like Python, R, or Tableau
  • Reduce file size and complexity – CSV is lightweight and universal
  • Feed data into APIs that accept CSV format
  • Simplify data sharing – CSV opens in any text editor or spreadsheet app

How to convert XLSX to CSV – 3 simple steps

  1. Upload your Excel file – click “Upload Excel” and select any .xlsx or .xls file from your computer.
  2. Preview your data – see the spreadsheet contents in a table; verify rows and columns.
  3. Get CSV output – click “Convert to CSV”, then copy the text or download as a .csv file.

XLSX to CSV converter – features you’ll love

  • ✅ 100% browser‑based – no upload, no server, no privacy concerns
  • ✅ Supports both .xlsx and .xls – works with modern and legacy Excel files
  • ✅ Preserves rows and columns – exact structure from your sheet
  • ✅ Live table preview – see data before conversion
  • ✅ Copy to clipboard or download .csv – flexible output for any workflow
  • ✅ Works offline after first load – no internet needed
  • ✅ Handles large Excel files – browser memory permitting

Why DataFrog’s Excel to CSV tool stands out

  • Privacy first – your Excel file never leaves your device. Many converters upload your data – we don’t.
  • Fast client‑side conversion – uses SheetJS to parse and convert directly in your browser.
  • Clean, standard CSV output – fields are quoted only when necessary, commas escaped properly.
  • Editable preview table – you can modify the data before generating CSV.
  • No signup, no limits – convert as many files as you want, any size.

Supported Excel formats

  • Microsoft Excel .xlsx (Excel 2007 and later)
  • Microsoft Excel .xls (Excel 97-2003)
  • Single‑sheet workbooks (first worksheet is used)
  • Tabular data with headers or without

Common use cases for Excel to CSV conversion

  • 🗄️ Database import – load Excel data into SQL or NoSQL databases
  • 🌐 API preparation – convert spreadsheet data to CSV for bulk API uploads
  • 📊 Data analysis – use CSV in Python (pandas), R, or Excel itself
  • 🔄 Migrating between systems – many CRMs and ERPs accept CSV
  • 📁 Lightweight storage – CSV files are smaller and more portable than XLSX

Privacy & Security

  • 🔒 All processing happens locally in your browser
  • 🚫 No file upload – your data never touches our server
  • 🕵️ No tracking, no logs, no third‑party scripts
  • 💼 Safe for sensitive data (financial, personal, proprietary)

Frequently asked questions (XLSX to CSV)

Does this tool support large Excel files?

Yes – it works within your browser's memory limits. Most standard Excel files (up to 50MB) convert instantly. Very large files depend on your device’s available RAM.

What if my Excel file has multiple sheets?

Currently, the tool converts the first worksheet only. If you need other sheets, you can open the file in Excel and save each sheet as a separate CSV, or use a dedicated multi‑sheet converter.

Is Excel formatting (colors, fonts, formulas) preserved?

No – CSV is a plain‑text format that only stores raw data. Formulas are replaced with their calculated values, and all formatting is stripped. This is standard for any CSV conversion.

Can I edit the data before converting to CSV?

Absolutely. The preview table is fully editable. You can change cell values, delete rows, or add new rows before generating the CSV – all live in your browser.

Is my Excel file uploaded to a server?

No. The tool runs entirely in your browser using the SheetJS library. Your file never leaves your computer – that’s why it works offline too.

Is this XLSX to CSV converter really free?

Yes, completely free. No hidden fees, no premium tiers, no watermarks. DataFrog believes essential tools should be accessible to everyone.