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Convert Excel to CSV/JSON and CSV/JSON to Excel, fully in your browser.
Convert Excel spreadsheets to CSV or JSON, and turn CSV or JSON back into a downloadable .xlsx workbook — all in your browser. Supports multi-sheet .xlsx and .xls files, sheet preview, header-row detection, array-of-objects or array-of-arrays output, ISO date formatting, and per-sheet or bulk export. Files are processed locally and never uploaded to any server.
This tool provides fast, client-side conversion between Excel spreadsheets (.xlsx, .xls) and structured data formats like CSV and JSON without requiring software installation or server uploads. It supports multi-sheet files, customizable output structures, and sheet previews directly in the browser, ensuring complete data privacy.
Good to know: Extremely large spreadsheets or complex automated batch pipelines may require dedicated desktop software or programmatic scripts rather than an in-browser converter.
Convert Excel files to CSV or JSON and back to .xlsx format directly in your browser without uploading data to a server.
Upload your spreadsheet or data file
Select your .xlsx, .xls, .csv, or .json file from your device to begin the conversion process. Files are processed locally in your browser for maximum privacy.
Preview and select specific sheets
Review the sheet preview to verify your data and select individual sheets if you are working with a multi-sheet Excel workbook.
Configure your output format settings
Choose between CSV or JSON output, and select specific options like array-of-objects, array-of-arrays, or ISO date formatting.
Convert and download your file
Click the convert button to generate your new file and download the resulting .xlsx, .csv, or .json document instantly.
Estimated time: PT1M
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100% private — your files are converted entirely in your browser and never uploaded to any server.
Drop an Excel file here, or click to browse
.xlsx or .xls — up to 20 MB
