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APPLIES TO: 
Power BI Desktop
Power BI service
Tooltips provide an elegant way to give contextual information and detail to data points on a visual. The following image shows a tooltip applied to a chart in Power BI Desktop. You can customize tooltips in Power BI Desktop and in the Power BI service.
Tip
Quick customization: Drag any field from your data into the Tooltips bucket in the Visualizations pane to add it to your tooltip. For more advanced tooltips, see Create tooltips based on report pages.
When you create a visualization, the default tooltip displays the data point's value and category. Many situations call for customizing the tooltip information. Customizing tooltips provides context and information for users viewing the visual. By using custom tooltips, you can specify more data points that display as part of the tooltip.
How to customize tooltips
To create a customized tooltip, drag a field into the Tooltips bucket in the Fields well of the Visualizations pane, as shown in the following image. In the following image, three fields are placed into the Tooltips bucket.
After you add fields to Tooltips, hovering over a data point on the visualization shows the values for those fields.
Customize tooltips with aggregation or quick measures
You can further customize a tooltip by selecting an aggregation function. Select the arrow beside the field in the Tooltips bucket. Then select from the available options.
In Power BI Desktop, you can also select a quick measure. Read about creating quick measures in Power BI Desktop.
There are many ways to customize tooltips, using any field available in your semantic model, to convey quick information and insights to users viewing your dashboards or reports.
Allow tooltips to auto-scale (preview)
You can change a report setting so that tooltips adjust their size automatically based on the canvas size.
In Power BI Desktop, select File > Options and settings > Options.
Under Current file, select Report settings, and 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.