Free online Parquet viewer, SQL workbench and converter. Everything runs locally in your browser — your files never leave your device.

I got tired of spinning up a notebook just to peek at a .parquet file someone sent me, so I built ParquetKit: a viewer, SQL workbench, and converter that run entirely client-side. The core idea is two engines loaded at different times. hyparquet (~10KB) reads just the metadata footer for an instant schema and preview, and DuckDB-WASM lazy-loads only when you actually run SQL or convert a file. There's no backend at all, it's a static export, so there's nowhere to upload your file to, which matters if you're dealing with data you can't paste into a random online converter or AI chatbot. Everything is free, no signup, MIT licensed. Would love feedback, especially on what formats you'd want next: Avro? Arrow?

Adding support for exporting query results directly to Parquet, JSON, or CSV would be super useful for building quick data pipelines.

Runs locally in the browser is a smart promise, and actually delivering on it without lag is the hard part. Glad to see you pulled it off.

Adding support for exporting query results directly to Parquet, JSON, or CSV would be super useful for building quick data pipelines.

Runs locally in the browser is a smart promise, and actually delivering on it without lag is the hard part. Glad to see you pulled it off.

ParquetKit

View, query and convert Parquet files in your browser

View, query and convert Parquet files in your browser