Data Conversion

Spreadsheet ⇄ JSON/CSV Converter

Upload an Excel workbook (.xlsx / .xls) or a CSV, pick a sheet, and export it as JSON or CSV. Or go the other way — paste JSON or upload a CSV and download it as a real .xlsx workbook. Everything runs locally in your browser; nothing is uploaded to a server.

Drop a spreadsheet here, or click to browse

.xlsx, .xls, .xlsm, .csv, .tsv — any size, nothing uploaded.

Sheet

Output format

First row is header

File: — Rows: — Columns: —

Preview (first 20 rows)

JSON output

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Source

JSON — an array of flat objects, e.g. [{"name":"Ada","age":30}]

Upload a CSV file

…or paste CSV text

Sheet name

File name

Building the workbook client-side with SheetJS — the .xlsx file is generated and downloaded directly in your browser.

Preview (first 20 rows)

Rows: — Columns: —