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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.

Histogram maker with automatic bins and statistics

Bin a list of numbers into a histogram, with the summary statistics beside it - here in this tab, with nothing uploaded.

How to make a histogram

Paste a column of numbers.
Leave the bins on automatic, or type how many you want.
Save the histogram; the statistics are drawn beside it.

Why this one stays private

Histograms are for real measurements - exam marks, lab readings, response times. The numbers are binned and summarised in the tab and are never sent anywhere.

Questions

How are the bins chosen?

With the Freedman-Diaconis rule, rounded to a tidy width like 5 or 10, so bin edges fall on round numbers. Type a number of bins to override it.

Which statistics are shown?

Count, mean, median, sample standard deviation (Excel STDEV.S), minimum, maximum and the quartiles.

Which bin does a value on an edge go in?

The one it starts: a bin from 60 to 70 holds 60 but not 70. The very top value goes in the last bin.

Can it draw a bell curve over it?

Yes - tick 'Normal curve' to overlay the normal distribution with the same mean and standard deviation.

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 histogram

Why this one stays private

Questions

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