1. Download your Slack profile picture from Slack. You can do this by clicking the drop down menu on the top left of Slack > View Profile > right click your profile > Copy Image URL > navigate to the URL and save the image.
  2. Go to the overlay image below and download it via right click > Save As.
  3. Using Pixlr, open your profile picture. Then, go to Layer > Add Image As Layer > select the overlay image. It may take a moment for the overlay image to load. Once it’s loaded, you can resize and reposition it over your profile picture. To download the profile picture with the overlay, hit File > Save. Now you can go back to your Slack profile and click Edit Profile to use your new picture.