How to add a watermark to your chart

There are two ways you can add a watermark:

  1. Use the backgroundImageUrl Chart.js plugin. This will place an image in the background of your chart. You can supply a watermark image that contains, for example, the logo of your company. See documentation and an example chart.

  2. Use the watermark API. Supply the chart URL as the mainImageUrl, and supply a separate watermark image as markImageUrl. This option is more customizable.

Here’s an example chart created using the watermark API technique: