Free Scatter Chart Maker

Paste 2–60 data rows with X and Y, optionally a label and bubble size. Use tabs, commas or semicolons between cells. A header such as X, Y, Label identifies a numeric label column unambiguously. Coordinates accept zero, decimals and scientific notation, but not negatives or missing values. Numeric inputs must be finite and no greater than 9,007,199,254,740,991; values too small to represent are rejected. Bubble size must be at least 1.

An invalid paste does not replace any of the accepted chart. Fix its row/column feedback before building. In the selected-point inputs, a blank, malformed, negative or nonfinite draft leaves the last accepted value in place with a message. Enter, Escape or leaving the field restores that accepted value. A valid edit changes the point and recalculates the fit.

A starter replaces the dataset, title, subtitle, axes, quadrant captions and layout. Pasting replaces the points and, when a header is enabled, the axis names; it keeps the title and subtitle. A size column selects Bubble. A paste without sizes changes Bubble to Scatter, but otherwise retains the current layout, including Quadrant. Choose Scatter explicitly for the worked example. Switching layout alone preserves the points.

For a nonconstant dataset, r² describes how well a straight-line model fits Y against X, from 0 to 1. It does not show whether the slope is positive or negative, prove causation or rule out a nonlinear pattern when low. Outliers can strongly affect the fit. Inspect the plotted observations and their context before drawing a conclusion.

A y-on-x line cannot be fitted when all X values are identical, and the chart explains this. When X varies but every Y is identical, it draws a horizontal line and marks r² undefined because Y has no variation. At least two observations are needed. These cases should not be reported as evidence that one variable predicts another.

Axes start at zero and scale automatically. Small values use smaller ranges and decimal or scientific tick labels; there are no manual axis-limit controls here. During a drag, the current ranges stay fixed and the point is constrained to that plot. Ranges recalculate on release. Use exact X/Y inputs when precision matters, and never move measured points merely to make the relationship look stronger.

Scatter compares paired numeric observations. Quadrant adds four editable zone captions for a labelled planning map; the zones are not a statistical test. Bubble adds a third value through dot size. A label-first format such as Label, X, Y, Size works with an explicit header. All three layouts use the same points and linear-fit option; bubble sizes are not regression weights.

Editing and standard Download PNG are free, with no signup or watermark. Compact is 760×560, Report is 960×620 and Slide is 1200×675. The export contains the chart, not the selected-point toolbar or input warnings; inspect the actual file before sharing. SVG, HD PNG and MP4 require Pro access or an active export pass. Save and reopening saved designs require an account. Downloading a PNG does not save an editable project.