Paste your data as CSV with labels in the first column and numbers in the columns after it, or load a .csv file. Set the title, axis labels, colour theme and value labels, then download the chart as SVG or PNG.
No. The CSV you paste or load is parsed entirely in your browser's memory using JavaScript, and the chart is drawn locally as inline SVG. Nothing is transmitted, logged or stored anywhere, which matters when you are charting confidential revenue, payroll or customer figures.
SVG is a vector file: the bars and text stay perfectly sharp at any size, so it scales cleanly into a report, a poster or a slide deck without pixelation. PNG is a raster image exported at 2x resolution, which is easier to paste into apps such as email clients or chat tools that do not accept SVG.
Yes. Put your category names in the first column and add one extra column per series. Each extra column becomes its own coloured group of bars with an automatic legend, and the vertical axis rescales to fit every series including negative values.