XLSX to CSV Converter

Convert Excel XLSX files to CSV format. Fast, secure, and completely client-side conversion with customizable delimiter options.

Overview

This XLSX to CSV converter reads your Excel workbook entirely inside the browser using client-side JavaScript — your spreadsheet never leaves your device. Drop in a modern .xlsx or legacy .xls file, choose from comma, semicolon, tab, or pipe delimiters, select the sheet you want, and preview the CSV output before downloading. Formula cells are exported as their computed values, and Unicode text is preserved in UTF-8, so the resulting file opens cleanly in Excel, Google Sheets, pandas, or any data pipeline that expects plain CSV.

Key Features

  • Convert XLSX to CSV format
  • Customizable CSV delimiters
  • Preview before download
  • Preserves data integrity
  • Handles multiple sheets

Common Use Cases

  • Data Pipeline Prep — Analysts and data engineers convert Excel exports to CSV before loading them into pandas, SQL databases, or ETL workflows that do not accept XLSX.
  • Regional Delimiter Compatibility — European users and systems that expect semicolon-delimited files can switch the delimiter in one click instead of manually reformatting after conversion.
  • Sensitive Business Data — Finance and HR teams convert payroll or budget spreadsheets without risk — because nothing is uploaded to an external server, confidential figures stay on the local machine.
  • Multi-Sheet Workbooks — Users with complex workbooks select exactly which sheet to export, producing a clean single-table CSV rather than a jumbled merge.
  • Quick Format Validation — Developers and QA engineers preview the CSV output directly in the browser to verify column order and encoding before committing the file to a repository or data store.

How It Works
1

Upload XLSX File

Select your Excel XLSX file from your device. The tool supports both modern .xlsx and legacy .xls formats.

2

Configure CSV Options

Choose your preferred CSV delimiter (comma, semicolon, tab, or pipe) and select which sheet to convert if multiple sheets exist.

3

Download CSV

Preview the converted CSV data and download the file instantly. Data integrity is preserved throughout the conversion.

Frequently Asked Questions

What Excel file formats can I convert?
You can convert both modern Excel files (.xlsx) and legacy Excel files (.xls). The tool automatically detects and processes both formats.

Can I choose different CSV delimiters?
Yes, you can choose from comma (,), semicolon (;), tab, or pipe (|) delimiters. This ensures compatibility with different systems and regional preferences.

How are multiple sheets handled?
If your Excel file contains multiple sheets, you can select which sheet to convert. Each sheet will be converted to a separate CSV file if you choose to convert all sheets.

Will formulas be converted?
The tool converts the calculated values of formulas, not the formulas themselves. This ensures your CSV contains the actual data values.

How are special characters handled?
Special characters and Unicode text are properly preserved during conversion. The output CSV uses UTF-8 encoding to maintain data integrity.

Is there a limit on file size?
The tool can handle Excel files up to 50MB. For larger files, consider splitting your data across multiple smaller workbooks.

Related Tools

Invoice Builder CSV to JSON Converter CSV to XLSX Converter JSON to CSV Converter JSON to XLSX Converter Markdown Editor & Live Preview