CSV and JSON converter
Quick help
CSV to JSON keeps every value as text, including leading zeros. JSON input must be an array of flat objects with the same keys. JSON null becomes an empty CSV cell. Excel XLS and XLSX files need an audited library and are not supported. Export a CSV from your spreadsheet first.
- Paste or load your data and choose the options.
- Prepare the result and review the preview.
- Download results or print. Export a draft before closing.
What it does not do: No uploads, cloud sync or automatic storage. No Excel workbooks. No guessing dates or address verification.
CSV to JSON keeps every value as text, including leading zeros. JSON input must be an array of flat objects with the same keys. JSON null becomes an empty CSV cell. Excel XLS and XLSX files need an audited library and are not supported. Export a CSV from your spreadsheet first.
Limits: 1 MB per input file, 10,000 data rows, 100 columns. Mail merge: 500 recipients. Preview tables show the first 100 rows. Downloads include all rows.
CSV downloads prefix cells that could be spreadsheet formulas with an apostrophe, including negative numbers. Check types when importing. JSON and draft exports preserve the original text. UTF-8 and comma-separated CSV only.
Import is kept in this page's memory. The original profile file is unchanged.
Preview / results
Enter your details on the left to prepare your result.