You must provide a 128x128-pixel extension icon image in the [ZIP file of your extension](https://developer.chrome.com/docs/webstore/publish#create-your-items-zip-file). Some requirements for the image:
The actual icon size should be 96x96 (for square icons); an additional 16 pixels per side should be transparent padding, adding up to 128x128 total image size. For details, see [Icon size](https://developer.chrome.com/docs/webstore/images?hl=en#icon-size).
The image must be in PNG format.
The image should work well on both light and dark backgrounds.
When you design the icon, keep the following advice in mind:
Don't put an edge around the 128x128 image; the UI might add edges.
If your icon is mostly dark, consider adding a subtle white outer glow so it'll look good against dark backgrounds.
Avoid large drop shadows; the UI might add shadows. It's OK to use small shadows for contrast.
If you have a bevel at the bottom of your icon, we recommend 4 pixels of depth.
Make the icon face the viewer, rather than having built-in perspective. See [Perspective](https://developer.chrome.com/docs/webstore/images?hl=en#icon-perspective) for details.