Pick a representative timestamp
A midpoint frame is convenient but rarely the best thumbnail. Move through the source to find a sharp, well-composed moment.
JPEG is efficient for photos
Use JPEG for photographic thumbnails; PNG is useful when lossless pixel values matter.
Do not upscale a weak frame
Thumbnail extraction can preserve a frame, not create detail that the video did not contain.
Check rights and context
A technically extracted thumbnail can still be inappropriate if it misrepresents the video or you lack rights to publish it.
Official marketplace references
Requirements can change. Review the source before publishing an important listing.
Mediabunny browser media toolkit documentation ↗