Parquet to chart

Load an Apache Parquet file — or pick one of eight built-in sample datasets — and turn it into a chart. Choose the chart type, X/Y fields, series, and aggregation; everything renders locally in your browser and nothing is uploaded.

How it works

Drop a .parquet file onto the page or pick a built-in sample. Choose a chart type — bar, line, area, scatter, histogram, pie, heatmap, or box plot — then map columns to the X axis, Y axis, and an optional series, and pick an aggregation (count, sum, average, min, or max). The chart redraws instantly as you change the configuration.

Eight sample datasets

No file handy? Eight synthetic sample datasets are built in, each tuned to show off a chart type:

• City transit ridership — daily riders per line, a natural line and area chart.
• Marathon results — finish-time distributions for histograms and box plots.
• Botanical garden catalog — correlated plant measurements for scatter plots.
• Coffee-shop sales — hour-by-weekday order grid for heatmaps.
• Plus library loans, movie box office, video game reviews, and space launches. All data is generated deterministically — none of it is real.

Export your chart

Download the finished chart as an SVG vector file or a PNG image. Both are produced locally in the browser — there is no server-side rendering. The chart configuration is mirrored into the URL fragment, so a link reproduces the same chart.

Private by design

The Parquet file is decoded in your browser via WebAssembly and every aggregation and chart is computed locally — nothing is uploaded. The URL fragment never reaches a server.