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Local data converter

CSV to JSON

Convert CSV to JSON tables in your browser. Up to 5 MB. CSV and TSV use a header row; JSON uses an array of flat objects.

Convert a data file

JSON · CSV · TSV · up to 5 MB · stays in your browser

or drop it here

CSV and TSV need a header row. JSON needs an array of flat objects. Up to 100 columns and 200,000 cells; output up to 10 MB. Spreadsheet formulas are escaped on export.

Nested JSON is rejected so no structure is silently lost. Values from CSV and TSV remain strings in JSON. Formula-like cells are prefixed with an apostrophe in CSV and TSV output.

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