Mobile readability
A good thumbnail remains clear when it is small. Check text size, contrast and subject visibility before using it in a post or campaign.
Thumbnail preview
Paste a YouTube video link or ID to preview public thumbnail assets and open different thumbnail sizes. Use this for your own videos, blog embeds, lessons and creator planning.
A good thumbnail remains clear when it is small. Check text size, contrast and subject visibility before using it in a post or campaign.
YouTube may expose default, medium, high, standard and max-resolution thumbnail files depending on the video and upload state.
Thumbnail images can be copyrighted. This tool helps preview links; it does not grant reuse rights.