Spreadsheet Converter
Upload any spreadsheet and convert it to XLSX, CSV, TSV, ODS, or JSON instantly. All processing happens in your browser — your files never leave your device.
Drop a spreadsheet here or browse
XLSX · XLS · CSV · ODS · TSV
About Spreadsheet Converter
The Spreadsheet Converter transforms spreadsheet files between the most common formats — XLSX, XLS, CSV, TSV, ODS, and JSON — entirely in your browser using SheetJS. Upload a file, preview the contents, select an output format, and download the converted file instantly. Your data is never uploaded to a server.
Use Cases
- →Convert Excel files to CSV for data pipelines and ETL workflows
- →Export spreadsheet data as JSON for REST APIs and JavaScript applications
- →Open ODS files from LibreOffice in Excel-compatible XLSX format
- →Transform CSV exports from databases into structured JSON objects
Tips
- ✓The first row is used as property names when exporting to JSON
- ✓TSV is ideal for data that contains commas, such as addresses or descriptions
- ✓Large files may take a few seconds to process — all computation runs in your browser
- ✓Use the demo to explore the tool before uploading your own data
Frequently Asked Questions
You can upload files in XLSX, XLS, CSV, ODS, and TSV formats. Output formats include XLSX (Excel), CSV, TSV, ODS (LibreOffice), and JSON.
When you choose JSON as the output format, the converter uses the first row of the spreadsheet as the property names (keys) for each object. Every subsequent row becomes one object in the resulting array.
No — all conversion happens entirely in your browser using SheetJS. Your file is never sent to any server.
If the file cannot be parsed — because it is corrupted, password-protected, or in a format the tool does not support — an error message appears.
Yes. Since all processing happens in your browser, the practical limit depends on your device's available memory. Most spreadsheets up to several hundred megabytes convert without issues.
CSV (Comma-Separated Values) uses a comma to separate fields, while TSV (Tab-Separated Values) uses a tab character. TSV is often preferred when data contains commas.