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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Box plot maker (box and whisker plot)

Compare groups with box and whisker plots: quartiles, outliers and means - here in this tab, with nothing uploaded.

How to make a box plot

Paste one column per group, with names in the first row - or two columns: group, value.
Choose how quartiles and whiskers are calculated.
Save the plot; each group's five-number summary is listed below it.

Why this one stays private

Box plots summarise real data - class results, trial measurements, salaries. Everything is calculated in your browser and nothing is uploaded.

Questions

Why do different tools give different quartiles?

There are several accepted methods. 'Inclusive' matches Excel's QUARTILE.INC and most calculators; 'Exclusive' matches QUARTILE.EXC. Pick the one your course uses.

What counts as an outlier?

With the 1.5 × IQR whiskers, any value more than 1.5 times the interquartile range beyond the box. Those are drawn as open circles. 'Min to max' whiskers show no outliers.

What is the cross?

The mean. The line across the box is the median.

What can I save it as?

PNG at twice the screen size, for documents and slides; SVG, a vector file that stays sharp at any size and opens in Illustrator, Figma, Inkscape or PowerPoint; or copy the image and paste it straight into a doc or a chat.

How to make a box plot

Why this one stays private

Questions

Other tools here