CSV → JSON only. Import preserves original line endings; pasting or editing normalizes them to LF. RFC 4180 subset: explicit separator, CRLF or LF records, double-quoted fields and quotes escaped as "". Quoted newlines, spaces, Unicode and leading zeros are preserved. All cells stay strings; formulas are never executed. Rows must have the same number of columns. A trailing record separator does not add a row. No CSV export.
Maximum 200,000 characters, 800,000-byte UTF-8 file, 10,000 rows, 200 columns, 50,000 cells and 2,000,000 output characters. Headers must be unique and nonempty.
Free and on your device. Content is never sent or saved to your account.