Overview
Open ThumbView to compare multiple thumbnail variants across grid, list, mobile, and size previews.
ThumbView Previewer helps creators test YouTube thumbnails before publishing. Upload, paste, or load a thumbnail from a YouTube URL, then preview it inside realistic YouTube-style layouts. See how your thumbnail looks in the home feed, search results, suggested sidebar, mobile feed, and real display sizes. Key features: Preview thumbnails in a YouTube-style feed with real surrounding thumbnail images. Test PC, tablet, and mobile layouts. Switch between light mode and dark mode. Check home feed, search results, suggested sidebar, mobile feed, and size preview views. Upload, drag and drop, paste, or load a public YouTube thumbnail from a video URL. Edit title, channel name, duration, views, and upload age. Shuffle placement to compare your thumbnail against neighboring videos. Use stress tests like squint, monochrome, dim, and tiny view. Review basic thumbnail readiness checks for aspect ratio, resolution, contrast, brightness, and title length. Optionally inject your preview thumbnail into the current YouTube tab for temporary local testing. ThumbView Previewer stores your thumbnail and preview settings locally in Chrome storage. The extension does not require an account and does not collect personal data.
Details
- Version1.4.2
- UpdatedMay 25, 2026
- Offered bywilly grizellat
- Size36.65KiB
- LanguagesEnglish
- DeveloperBOUZIDA MOHAND OAULI
7 Rue des Fauvettes Toulouse 31200 FREmail
grizellat@gmail.com - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
