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APPLIES TO: 
Power BI Desktop
Power BI service
Tooltips provide contextual information and detail for data points on a visual. You can customize tooltips in Power BI Desktop and the Power BI service.
When you create a visualization, the default tooltip displays the data point's value and category. Custom tooltips let you specify additional data points to display.
Tip
For more advanced tooltips based on custom report pages, see Create tooltips based on report pages.
Add fields to the tooltip field well
Select the visual you want to customize.
In the Build visual pane, drag a field into the Tooltip field well. You can add multiple fields. In the following image, three fields are added to the Tooltip field well.
Hover over a data point on the visualization to see the values for the fields you added.
Apply aggregation functions
You can further customize a tooltip by applying aggregation functions to fields.
In the Tooltip field well, select the arrow beside the field you want to aggregate.
Select from the available aggregation options.
Use quick measures
In Power BI Desktop, you can use quick measures to quickly and easily perform common, powerful calculations. For more information, see Create quick measures.
Enable tooltip autoscale (preview)
You can configure tooltips to adjust their size automatically based on the canvas size.
Select File > Options and settings > Options.
Under Current file, select Report settings.
Select Tooltip size is affected by canvas size.
Considerations and limitations
- Default tooltips aren't designed to contain large amounts of content. Their look and feel might change with Power BI updates. For more control over the look and feel of the content in a tooltip, create tooltips based on custom report pages.