Convert Apache Arrow and Feather files to a CSV table locally - columnar data made readable, no upload, right in your browser.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Apache Arrow is the widely used columnar in-memory standard for analytical data; the Arrow IPC file format (also Feather v2) stores such tables on disk and is used by pandas, Polars, R and many data tools. The file is compact and fast, but unreadable in a text editor. This tool reads the Arrow content and outputs a flat CSV table you can open in Excel, LibreOffice, Google Sheets or any text editor.
Everything runs entirely locally in your browser (flechette, pure JavaScript, no upload, even offline). The tool reads the Arrow schema and data blocks and turns each column into a CSV column. So no data is distorted, we emit 64-bit integers beyond the safe JavaScript range as a string, timestamps as ISO 8601 text and raw binary values as base64. Nested columns (lists, structs) appear in a CSV cell as compact JSON.
This is handy when pandas, Polars, R or a data tool hands you a .arrow or .feather file and you just want to peek inside, check it in a spreadsheet or pass it to a tool that speaks CSV. Note: the Arrow IPC file format (Feather v2) is supported; the older Feather v1 is not read. The conversion is one-way (Arrow to CSV) and does not write back to Arrow.
| Input formats | ARROW, FEATHER, IPC |
|---|---|
| Output format | CSV |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: The Apache Arrow IPC file format (also Feather v2) is supported; the older Feather v1 is not read. Nested columns (lists/structs) are shown in the cell as JSON. Large 64-bit integers appear as a string (precision), timestamps as ISO 8601, binary values as base64. The conversion is one-way (no CSV back to Arrow). Very large files need memory accordingly.
The Arrow IPC file format (Feather v2) stores a columnar table on disk; it is used by pandas, Polars and R.
No. The conversion happens entirely locally in the browser - even offline.
Yes, Feather v2 is the Arrow IPC file format. The older Feather v1 is not read.
64-bit integers beyond the safe JS range are output as a string, timestamps as ISO 8601, binary values as base64.
Not here - this tool is one-way (Arrow to CSV) for inspecting and reusing the data.