Excel (XLSX) to Parquet Converter
Handles Up to 1 Million Rows

Convert Excel XLSX files to Apache Parquet format instantly, right in your browser. Your files never leave your device — no server, no upload. Powered by DuckDB-WASM with Snappy compression.

Drag & drop your file here, or browse

Accepts: .xlsx (up to 100 MB)

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How to Convert Excel (XLSX) to Parquet

Drag and drop your XLSX file onto the drop zone above, or click to browse.

Conversion starts automatically — Excel data is parsed and compressed into Parquet format.

Click the "Download Parquet" button to save the result.

Key Features of This XLSX to Parquet Converter

100% Local Processing: Your Excel files are processed entirely in your browser using DuckDB-WASM. No data is uploaded to any server.
Snappy Compression: Output uses Snappy compression for an optimal balance of file size and read speed. Widely supported by Spark, BigQuery, and DuckDB.
Free with No Limits: Convert as many files as you want, completely free. No sign-up, no watermarks, no hidden fees.

Excel (XLSX) vs Parquet: What's the Difference?

Excel and Parquet serve different purposes. Here is a comparison to help you choose:

	Excel (XLSX)	Parquet
Primary Use	Spreadsheet editing	Analytics & data pipelines
Compression	ZIP (XML-based)	Snappy / Zstd columnar
Query Speed	Slow (row-based)	Fast (columnar, predicate pushdown)
Ecosystem	Microsoft Office, Google Sheets	Spark, BigQuery, DuckDB, Polars
Schema	Flexible (mixed types per column)	Strict (typed columns)

Benefits of Converting XLSX to Parquet

Smaller File Size — Parquet is typically 3-10x smaller than the equivalent CSV data thanks to columnar compression.
Faster Analytics — Columnar storage enables fast aggregation and filtering without scanning entire rows.
Pipeline Ready — Parquet is the standard format for data pipelines, supported natively by Spark, BigQuery, DuckDB, and Polars.

Frequently Asked Questions

Is my data uploaded to a server?

No. Your file never leaves your browser. All processing happens locally using DuckDB-WASM. No data is sent to any server.

Can I convert Excel files to Parquet?

Yes. This tool uses an efficient SAX parser to extract data from XLSX files and DuckDB-WASM to generate optimized Parquet output with Snappy compression, all in your browser.

What compression is used?

The output uses Snappy compression by default, which offers a good balance of compression ratio and speed. Snappy is widely supported by Spark, BigQuery, DuckDB, and other analytics tools.

How much smaller is the Parquet file?

Parquet files are typically 3-10x smaller than the equivalent CSV data thanks to columnar storage and compression. Converting from XLSX to Parquet can significantly reduce file size.

What is the file size limit?

The input limit is 100MB. XLSX files are ZIP-compressed, so 100MB of XLSX can contain a large amount of data. The Parquet output will be significantly smaller than the original.

Which sheet is converted?

The first sheet in the workbook is converted. Multi-sheet conversion is not currently supported.