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Excel to CSV & JSON

Convert every sheet of many Excel or ODS workbooks to CSV, TSV, JSON or NDJSON in one go.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Excel to CSV & JSON works

Files are opened in your browser with SheetJS and JSZip. Nothing is uploaded, and your original file is never changed. Each sheet becomes its own file. JSON can be rows as objects, arrays or columns, with dotted headers nested.

Input: XLSX, XLS, ODS, Numbers. Output: CSV, TSV, JSON, NDJSON, ZIP.

How to use Excel to CSV & JSON

1. Drop the workbooks.
2. Pick CSV, TSV, JSON or NDJSON.
3. Set separator and JSON options.
4. Press Convert and download.

Tips

• Excel, ODS and CSV all work. Formulas are read as their last saved values.
• For CSV files with odd characters, save them as UTF-8 first.

Excel to CSV & JSON FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Related tools

• CSV to Excel: Make a proper XLSX or ODS from CSV files with numbers as numbers, a frozen bold header, filters and fitted columns.
• CSV & Excel Converter: Convert CSV, XLSX, JSON, Markdown, TSV, HTML and SQL both ways.
• Split Excel Workbook: Save each sheet as its own file, cut a long sheet every N rows, or split rows by the value in a column.
• Merge Excel Files: Combine sheets from many Excel, ODS or CSV files into one workbook, or stack their rows into one table.