Are my XLSX 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 XLSX 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 XLSX to Parquet lose quality?

No. Parquet stores the same content without discarding anything, so the result is identical in quality to the original.

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.

XLSXtoParquet

Convert XLSX to Parquet

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

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

What XLSX and Parquet are for

The Excel format since 2007. Several sheets, formulas, formatting.

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

How to convert XLSX to Parquet

Drop your XLSX 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.

XLSX vs Parquet: what changes

XLSX compared with Parquet
	XLSX	Parquet
Full name	Excel Workbook	Apache Parquet
File extension	.xlsx	.parquet
Media type	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet	application/vnd.apache.parquet
Compression	—	Lossless — nothing is discarded

Quality: Nothing is lost. The result holds exactly the same picture, text or data as the original.
Where it runs: This conversion is not available yet. The page describes what it will do once the engine ships.

XLSX to Parquet: common questions

Are my XLSX 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 XLSX 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 XLSX to Parquet lose quality?: No. Parquet stores the same content without discarding anything, so the result is identical in quality to the original.
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.