Guides
Practical, tool-agnostic guides on working with Parquet files. RSS
How to Merge Multiple Parquet Files into One
Combine several Parquet files into a single dataset with DuckDB SQL in your browser — including files whose schemas don't quite match — or with pyarrow.
How to Open a Parquet File Without Spark or Python
Five ways to open and inspect a Parquet file — from zero-install browser tools to DuckDB one-liners — and when each one makes sense.
How to Open a Parquet File in Excel (Step by Step)
Excel cannot read Parquet natively. Convert the file to CSV in your browser — and trim oversized files with SQL first — to get it into a spreadsheet.
Parquet vs CSV: Size, Speed and When to Use Each
A practical comparison of Parquet and CSV — file size, query speed, type safety and tool support — with concrete guidance on choosing.
Query Parquet Files with SQL — No Database Required
Run real SQL against local Parquet and CSV files using DuckDB in the browser: joins, aggregates and window functions with zero setup.