In wave.video editor you can export any frame to JPG, PNG, or GIF format. Only PNG and GIF support transparency.
How to start? First, find the frame on the timeline and put the play head on it. Then, Click “Publish”, and select “Current Image”:
Here you can choose the resolution, format, quality, and tick if you want transparent background (not for JPG):
JPG offers configurable quality, in general, it's the best size/quality trade off. PNG provides the best quality and generates the biggest file. GIF is somewhere in the middle.
When you've made your choice, just press “Generate”, then download the file!