Make thumbnails people notice.
A strong thumbnail should communicate one idea immediately. PromoGenerator keeps the editing controls practical while showing how the image will hold up at the smaller sizes people actually see.
01
Lead with one image
Choose a clear subject with enough contrast to remain recognizable on a phone.
02
Keep the headline short
Use a few bold words that support the video title instead of repeating it.
03
Check every preview
Review home, search, sidebar, and mobile sizes before downloading the final file.