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I've created a basic child image for twentytwelve, and it works as expected. The only issue is that it does not have a thumbnail image in the themes page:

enter image description here

How do I set a thumbnail image for my child theme?

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up vote 4 down vote accepted

Create image file in PNG Format having name screenshot.png and save it in themes root folder.The recommended image size is 880x660. Even recommended image size is 880x660 though it will only be shown as 387x290 but the double-sized image allows for high-resolution viewing on HiDPI displays.

For more information see this page.

If you don’t already have a screenshot of your theme, You can create one easily by following below steps:

  1. Point your browser to the blog currently using the theme.
  2. Press the Print Screen button on the keyboard.
  3. Open a new file in Photoshop.
  4. Change the size to 300 by 225 (in pixels)
  5. Press Ctrl + v or Right click > Paste.
  6. With the Move tool activated, resize the screenshot to in the 600 x 450 space.
  7. Go to File > Save for Web…
  8. Save it as a PNG file.
  9. Name it screenshot.
  10. Place your image file in the theme’s folder.
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+1 Thanks, exactly what I needed. – Adam Matan Apr 1 '13 at 12:57
Update: "The recommended image size is 880x660. The screenshot will only be shown as 387x290, but the over double-sized image allows for high-resolution viewing on HiDPI displays." – drake035 Aug 10 '14 at 10:36

What Vinod Dalvi said, except:

Make sure the file is named using all lower case:

  • screenshot.png


  • screenshot.jpg.

screenshot.PNG won't work!

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