Are my NDJSON files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.

Is converting NDJSON to Parquet free?

Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.

Does converting NDJSON to Parquet lose quality?

NDJSON and Parquet describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent.

Do I need to install anything to open Parquet files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the Parquet afterwards needs whatever software normally handles Apache Parquet on your device.

NDJSONtoParquet

Convert NDJSON to Parquet

Up to 3 files at once, 100 with Pro. Mixed formats are fine.

NDJSON to Parquet conversion is not running yet. This page describes what it will do; the NDJSON conversions that work today are linked at the bottom.

What NDJSON and Parquet are for

One JSON object per line. What log pipelines and data exports stream.

Columnar storage for large datasets. Far smaller and faster to query than CSV.

How to convert NDJSON to Parquet

Drop your NDJSON file onto this page, or click to pick one.
Choose Parquet as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished Parquet file.

NDJSON vs Parquet: what changes

NDJSON compared with Parquet
	NDJSON	Parquet
Full name	Newline-Delimited JSON	Apache Parquet
File extension	.ndjson, .jsonl	.parquet
Media type	application/x-ndjson	application/vnd.apache.parquet
Compression	—	Lossless — nothing is discarded

Quality: The result is a close reconstruction rather than an exact copy. Check it before relying on it.
Where it runs: This conversion is not available yet. The page describes what it will do once the engine ships.

NDJSON to Parquet: common questions

Are my NDJSON files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
Is converting NDJSON to Parquet free?: Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.
Does converting NDJSON to Parquet lose quality?: NDJSON and Parquet describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent.
Do I need to install anything to open Parquet files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the Parquet afterwards needs whatever software normally handles Apache Parquet on your device.