View and convert data files
All in your browser, no uploads: open Parquet, CSV, Excel and other formats, explore in tables, export to another format and query with SQL when needed.
View CSV, JSON, YAML, YML, XML, Parquet, Arrow, Feather and XLSX files directly in your browser — your files never leave your device and nothing is sent to servers. Load one or many files, including Parquet and Excel spreadsheets, and explore data in interactive tables with paginated preview, filters, sorting and column profiling.
Convert any table to another format right in your browser: export the full table or a filtered view as CSV, TSV, JSON, YAML, XML, Parquet, Arrow, Feather or XLSX. Ideal for turning Parquet into CSV, Excel into JSON or any other combination — no software to install and no cloud uploads.
When you need deeper analysis, query your data with SQL via DuckDB-WASM — with JOINs, aggregations and complex filters. Viewing, conversion and queries all run 100% in your browser; your files stay on your device throughout.
Frequently asked questions
Which file formats can I view?
CSV, JSON, YAML, YML, XML, Parquet, Arrow, Feather and XLSX. Each file is opened and processed in your browser with no server upload, and shown as an interactive table with preview, filters and sorting.
Can I convert a file to another format?
Yes. Export the full table or a filtered view as CSV, TSV, JSON, YAML, XML, Parquet, Arrow, Feather or XLSX — for example, Parquet to CSV or Excel to JSON. Conversion also happens locally in your browser.
Can I also query the data with SQL?
Yes. The DuckDB-WASM engine runs in your browser and lets you write SQL queries with JOINs, GROUP BY, aggregations and other standard operations — without sending data to external servers.
Is my data sent to the internet?
No. Viewing, conversion and SQL queries are processed entirely in your browser. No files or queries are transmitted to external servers.