Tool 03 Files are processed locally in your browser
Format Converter
Convert between XLSX, CSV and JSON online — entirely in your browser, files are never uploaded.
1. Upload file
Drag Excel files here, or click to browse
Supports a single .xlsx / .xls / .csv file; the first sheet is processed
FAQ
How do I avoid garbled characters when converting Excel to CSV?
The exported CSV automatically includes a BOM header, so Excel opens it with correct encoding out of the box.
What JSON structure is produced?
Headers become field names and each row becomes an object — an array of objects ready for API debugging or programmatic use.
Are formulas and styles preserved?
CSV/JSON exports contain computed values; styles and formulas are Excel-specific and cannot be kept in text formats.
Can I convert CSV back to Excel?
Yes. Upload a CSV and convert it to XLSX or JSON; numeric columns keep their number type.