Bar chart checker

Beta

Upload a bar chart, or a leaflet with one in it, and we'll check whether the bars are drawn at the right heights for the numbers shown. The AI reads the chart, and your browser does the measuring, because AI vision isn't reliable at measuring pixels.

Your image is sent to be read and isn't stored. The measuring and the corrected chart happen in your browser.

Choose an image or a PDFPNG, JPG, WebP or PDF, up to 25MB. For a PDF we read the first eight pages.

How it works

The AI reads your chart and reports the labels, the numbers and roughly where each bar sits. It never measures anything. Your browser then finds the exact edges of each bar, you confirm the marks, and the maths compares the drawn heights with the heights those numbers deserve, measured from zero. You also get a corrected chart you can download.