Free Online Bubble Chart Maker
Create free bubble charts instantly — no account, no software, no limits. Plot XY data with a third dimension encoded as bubble size, assign groups for color coding, and add custom labels. Download as PNG or print directly from your browser.
What is a Bubble Chart?
A bubble chart is a variation of a scatter plot where each data point is displayed as a circle (bubble). The horizontal position encodes the X value, the vertical position encodes the Y value, and the size of the bubble encodes a third numeric dimension — typically a magnitude, frequency, or weight. Bubble charts are ideal for comparing three dimensions of data simultaneously, such as country GDP (X), life expectancy (Y), and population (bubble size).
How Do I Enter Data?
Each row is one data point. Fill in the five columns:
- X — horizontal position (numeric)
- Y — vertical position (numeric)
- Value — bubble size (numeric; negative values produce the same-size bubble marked with a − sign)
- Group — optional; points with the same group name share a color and appear in the legend
- Name — optional; a label displayed on or above each bubble
Click Example to pre-fill sample data, then Calculate Chart to render.
How Are Groups and Colors Used?
When you fill in the Group column, each unique group name gets its own color from the selected color palette. A legend is drawn on the right side (or top) of the chart listing each group. If the Group column is empty, all bubbles share the first color from the palette.
What Do Negative Values Do?
A negative Value is treated the same as its absolute value for sizing purposes — the bubble radius is proportional to |Value|. A small minus (−) sign is rendered inside the bubble to indicate that the original value was negative, making it easy to distinguish positive from negative magnitudes visually.
How Do I Customize the Chart?
Open the Appearance section to control axis titles, ranges, tick intervals, grid visibility, label positions (above/inside/none for both Name and Value labels), legend placement, color palette, and background color. Use the style strip — Classic, Ball, Transparent, Metal, Glass — to switch between visual themes instantly.
How Do I Download My Bubble Chart?
Save chart as PNG · 
Print chart