Offline CSV, JSON, Parquet and Excel Converter Install Data Utility as an app and convert files with no internet. SQL on files and OCR work offline too. Free and private.
Quick answer: Convert JSON, CSV, Parquet and Excel – one file or a whole folder.
Related: JSON, CSV, Parquet and Excel Converter · Avro Viewer Online: Open .avro Files · Avro to CSV Converter · CSV to Avro Converter · Offline and Private Data Tools
How to use the Offline CSV, JSON, Parquet and Excel 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: data.csv (no network)
Output: data.parquet
Browse by topic Who uses Data Utility Frequently asked questions · Data format benchmark
Frequently asked questions Does it really work offline? Yes. Install the app, click Make available offline once while online, then use every tool with no connection.
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.
Related pages 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.Avro Viewer Online: Open .avro Files : Open and view an Avro (.avro) file online: see the schema and records as a table, then save as CSV, JSON, Excel or Parquet. Free, no upload.Avro to CSV Converter : Convert an Avro file to CSV online. Nested records are flattened. Free, private, runs in your browser.CSV to Avro Converter : Convert CSV to an Avro (.avro) file online. Column types are detected and written into the Avro schema. Free and private: nothing is uploaded.Avro to JSON Converter : Convert an Avro file to JSON online. Nested records, arrays and maps stay nested. Free, private, no upload.JSON to Avro Converter : Convert JSON to an Avro (.avro) file online. The schema is built from your data. Free, private, no upload.Avro to Parquet Converter : Convert Avro to Parquet online for faster analytics in Spark, DuckDB or BigQuery. Free, private, runs in your browser.Avro to Excel Converter : Convert an Avro file to Excel (.xlsx) online so anyone can open it. 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