You need to include screenshots when submitting your app to the various app stores. 

When taking screenshots, here are a few things to keep in mind:

• Your screenshots must depict your app as it appears when it is running.
• Include screenshots that portray your app functionality. 
• Take screenshots that will make your app stick out.

Recommended Screen Capturing Tools

• Snipping Tool: Included in Windows 8, Windows 7, Windows Vista, and Experience Pack for Windows XP Tablet PC Edition 2005. To upload Snipping Tool, click Start > All Programs > Accessories > Snipping Tool.
• Jing: Click here to download this tool for free.

To take screenshots of your app:

1. Sign in to your Swiftic account.
    
2. Click Edit App.
    
3. Click on the device icons to see a preview of your app on the app simulator.
   
   a) Apple: iPhone 4, iPhone 5, iPhone 6
   
   b) Android: Smartphone and Tablet
   
   
    
4. Choose a screen to capture (see our recommendations above).
    
5. Open a screen capturing tool.
    
6. To take screenshots using Snipping tool:
   
   a) Click New.
   
   b) Press and hold the left mouse button to select the area of your screen that you want to capture, and then release.
   
   c) Click File> Save as, and save the screenshot on your computer.
   
   

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Relate Links:

Submit Your App via Swiftic to Google Play