ThumbSpy

Find and download high-resolution YouTube thumbnails, with optional channel research using your own YouTube API key.

ThumbSpy is a thumbnail research and download tool for YouTube creators. Find public YouTube thumbnails, compare visible video performance, and download the best thumbnail variant YouTube makes available. FEATURES • Page Scan Scan the active YouTube channel, search results, or watch page for visible video thumbnails. ThumbSpy continues watching the page for newly loaded thumbnails without requiring a refresh. • URL Lookup Paste YouTube video, Shorts, live, embed, or youtu.be links to find their available thumbnail variants. • Optional Channel Research Use your own YouTube Data API key to research public channels by newest uploads or official public view count. Requests go directly from your browser to Google using your own quota. • Performance Sorting Order results by their original page position, most views first, or least views first when view counts are available. • Best Available Quality ThumbSpy checks YouTube’s public image hosts and downloads the best available thumbnail variant. Some videos may not provide a maximum-resolution thumbnail. • Shorts Support For recognized YouTube Shorts, ThumbSpy prefers portrait thumbnail variants when YouTube provides them. • Bulk Downloads Download every displayed thumbnail to the ThumbSpy folder or stop a bulk download while it is running. • Persistent Results Your latest scan remains available when the popup is closed and reopened. Use Clear whenever you want to remove the saved results. PRIVACY Page Scan and URL Lookup do not require an API key. ThumbSpy has no developer-owned API key, account system, analytics service, advertising SDK, or backend server. An API key is needed only for optional Research mode. You can choose whether to remember it in local Chrome extension storage. ThumbSpy is not affiliated with YouTube or Google. Downloading a thumbnail does not grant ownership or permission to republish it. Users are responsible for respecting copyright, trademark, publicity, YouTube terms, and other applicable requirements.