Convert Arrow to NDJSON Online
Convert Arrow files to NDJSON format directly in your browser. No upload required — your data never leaves your device.
About this conversion
This tool converts Arrow files to NDJSON format directly in your browser — no account required, no file upload, no waiting for a server. It processes your data entirely within your browser using WebAssembly, so nothing ever leaves your device.
The tool preserves all columns and data types from your source file and writes a valid NDJSON file ready to download. Large files are handled efficiently using a vectorised columnar engine.
Frequently Asked Questions
What is NDJSON format?
NDJSON (Newline-Delimited JSON) stores one JSON object per line, making it easy to stream, append, and process incrementally.
Is my Arrow data private?
Yes — completely. Your file is never uploaded to any server. All conversion happens inside your browser using WebAssembly — locally, with no upload. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines can handle 500 MB to 1 GB comfortably.
What is the difference between Arrow and NDJSON?
Both Arrow and NDJSON are common data formats used in engineering and analytics workflows.
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