Extensions
YtThumbnail icon

YtThumbnail

Generate full-resolution YouTube thumbnails from any video ID in one block call.

18 September 2026v2.0
Free
Media

About

YtThumbnail Extension simplifies preview generation for YouTube content. Provide a video ID and receive the direct image URL at original resolution, perfect for displaying previews, sharing, or caching thumbnail assets inside your App Inventor projects.

Features

  • Single block to build the thumbnail URL from a YouTube video ID
  • Returns original resolution image for high quality previews
  • Works with any public YouTube video
  • Example usage provided for binding to Image components
  • Free download with optional creator support

Documentation

Turn a YouTube video ID into a thumbnail image URL.

Docs1

GetThumbnail

Methodreturns text

Returns the thumbnail image URL for a YouTube video ID.

ParameterTypeNotes
VideoIDtextYouTube video id (the value after v=).
Blocks1
YtThumbnail block 1

Compatible platforms

MIT App InventorKodularNiotronAndroid BuilderThunkable

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