# Requirements for the overlay file
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Set up the image files that you want to insert over your video as follows:
+ **File type**: Use .png or .tga.
+ **Aspect ratio**: Use any aspect ratio; it doesn't need to match the aspect ratio of the underlying video.
+ **Size in pixels**: Use any size. If the overlaid image is larger than the output video frame, the service crops the image at the edge of the frame.
**Note**  
In jobs that scale the video resolution, whether your overlay scales with your video depends on where you specify the image overlay. For more information, see [Sizing overlays](about-overlay-scaling.md).