Convert Excel to Parquet Online — Free, In-Browser

Excel is where data goes to lose its types. Dates become numbers, integers become floats, and “TRUE” becomes a string. Converting to Parquet fixes all of that — and PondPilot lets you do it in the browser with SQL-powered transformations.

How to Convert

  1. Open app.pondpilot.io
  2. Drop in your .xlsx file
  3. Preview the data and fix any issues with SQL
  4. Export as Parquet

The conversion runs entirely in your browser via DuckDB WebAssembly. Your Excel file never leaves your machine.

Why Parquet Over Excel?

  • 10-50x smaller file sizes due to columnar compression
  • Typed columns — integers stay integers, dates stay dates
  • Fast to query — columnar format means analytics engines love it
  • Universal — works with Spark, DuckDB, Pandas, Polars, BigQuery, Snowflake, and everything else

Clean Up During Conversion

Excel files are messy. PondPilot lets you fix that:

SELECT
  TRIM(name) as name,
  TRY_CAST(revenue as DECIMAL(12,2)) as revenue,
  STRPTIME(date_string, '%m/%d/%Y')::DATE as order_date
FROM excel_data
WHERE name IS NOT NULL AND name != ''

Remove empty rows, fix types, rename columns — then export a clean Parquet file.

Common Use Cases

  • Data engineers converting Excel reports into pipeline-friendly formats
  • Analysts archiving Excel data in a more efficient format
  • Scientists preparing Excel datasets for analysis in Python or R
  • Anyone tired of emailing 50MB Excel files that could be 2MB Parquet files

Privacy

Financial reports, HR data, customer lists — Excel files often contain sensitive business data. PondPilot processes everything locally. No upload, no cloud, no risk.

Get Started

Visit app.pondpilot.io and convert your Excel file to Parquet.

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