CSV to JSON Converter

Free CSV to JSON converter: drop a CSV, get clean JSON. Handles quotes, commas and large files, and never uploads your data.

Quick answer: Convert JSON, CSV, Parquet and Excel – one file or a whole folder.

How to use the CSV to JSON Converter

Convert JSON, CSV, Parquet and Excel – one file or a whole folder.

The Format Converter moves data between JSON, CSV, Parquet and Excel without code or an install. It reads your file in the browser, flattens nested JSON into columns, keeps or guesses column types, and writes the format you choose. Use it to open API data in Excel, load a spreadsheet into an app, shrink a big CSV into Parquet, or look inside a Parquet file. Nothing is uploaded, so it is safe for customer and business data.

Pick From and To
Drop or paste your data
Convert and download

Tips

Use the Batch / Folder tab to convert many files into one ZIP.
Nested JSON becomes columns like address.city.
Excel: the first sheet is read; old .xls files are not supported.

Example

Input: id,name 1,Ada

Output: [{"id":1,"name":"Ada"}]

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Who uses Data Utility

Frequently asked questions · Data format benchmark

Frequently asked questions

Does it handle commas inside quotes?

Yes. Quoted fields, line breaks and other delimiters are handled.

How big can a file be?

It depends on your device. A few hundred MB usually works.

Which conversions does the Format Converter support?

Any direction between JSON, CSV, Parquet and Excel (.xlsx), for one file or a whole folder. Nested JSON is flattened into columns such as address.city. For Excel, the first sheet is read; old .xls files are not supported.

Why did my number or date change after converting?

Types are detected from the values. Turn off "Detect types" to keep everything as text, which also keeps leading zeros in IDs and phone numbers.

JSON, CSV, Parquet and Excel Converter: Convert between JSON, CSV, Parquet and Excel online for free, one file or a whole folder. It runs in your browser, so nothing is uploaded.
JSON to CSV Converter: Convert JSON to CSV in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
CSV to JSON Converter: Convert CSV to JSON in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
CSV to Parquet Converter: Convert CSV to Parquet in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
JSON to Parquet Converter: Convert JSON to Parquet in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
Parquet to CSV Converter: Convert Parquet to CSV in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
Parquet to JSON Converter: Convert Parquet to JSON in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.
CSV to Excel Converter: Convert CSV to Excel in seconds. Drop a file or paste data and download the result. Private: it runs in your browser and nothing is uploaded. Large files too.