CSV and JSON converter

Convert local CSV and JSON with quoted cells, preserved identifiers, column types and downloadable output.

Open local file

CSV source

Delimiter

File encoding

Empty or duplicate headers

First row contains headersSkip empty rows

Keep identifiers intact

CSV cells stay strings unless you choose a column type. That preserves leading zeros and large identifiers. Numeric JSON tokens also retain their original digits in CSV. Null exports as your chosen text; missing keys export as empty cells. Formula protection deliberately prefixes spreadsheet expressions with an apostrophe. Input is limited to 10 MB, 100 columns and 100,000 rows; conversion output is limited to 20 MB.

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