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Convert Excel (XLS/XLSX) to CSV

Convert Excel spreadsheets (.xls/.xlsx) to CSV directly in your browser. Pick a sheet, choose a delimiter, and export. No upload required.

100% Secure - your files are processed in your browser and never sent to a server.
Drop your file hereor click to browseSupports Excel files (.xlsx, .xls, .ods) (Max 100MB)

How to use the Convert Excel to CSV tool

  1. Upload your Excel file: Drag and drop your .xls, .xlsx, or .ods file, or choose a file from your file explorer.
  2. Select a sheet: Pick the specific worksheet you want to convert from the dropdown menu.
  3. Configure output settings: Choose a CSV delimiter (comma, semicolon, tab, or pipe) and toggle whether the first row is a header.
  4. Convert to CSV: Click the "Convert Data" button to parse the selected sheet into CSV format.
  5. Export results: Copy the CSV output to your clipboard or download it as a file.

Frequently asked questions

Is it safe to use Convert Excel to CSV with sensitive or confidential data?
Yes, completely. All processing done by Convert Excel to CSV runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size Convert Excel to CSV can handle?
Convert Excel to CSV supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does Convert Excel to CSV process my data without uploading it?
Convert Excel to CSV uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use Convert Excel to CSV?
No installation, browser extension, or plugin is required. Convert Excel to CSV runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does Convert Excel to CSV work offline after the page has loaded?
Yes. Once Convert Excel to CSV has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

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