Line Graph Maker

Plots one or more lines from a data table you fill in — each row a point along the x-axis — and exports the result as PNG or SVG, with axis labels and hoverable points for reading exact values.

When a line chart beats a bar chart

Line charts are for showing a trend over a continuous or ordered axis — usually time. Where a bar chart compares separate categories, a line chart shows how a single measure moves: revenue over months, temperature over a day, a stock price over a year. The line itself, not individual points, is what carries the meaning — it shows direction and rate of change, which bars can't do as clearly.

Comparing multiple lines

Adding series plots several lines on the shared axes — actual vs forecast, this year vs last year, or several products' performance over the same period. Each line is labelled at its end point rather than relying only on a legend, so it stays readable even when lines cross.

Don't mix scales on one chart

Plotting two measures with very different scales — say, revenue in thousands and a conversion rate as a percentage — on one chart with a second y-axis is a common but misleading move, since shifting either axis can make the two lines appear to correlate or diverge arbitrarily. Better options: two separate charts, or index both series to a common starting value of 100 so they're comparable as relative change rather than absolute scale.