Thumblr - YouTube Thumbnail Preview icon

Thumblr - YouTube Thumbnail Preview

by alx.charbo · thumblr.io · Workflow & Planning
Established publisherManifest V3 Free
View in Chrome Web Store Data as of 17 Oct 2026

Preview your Thumblr thumbnails directly on YouTube

Users
11
−1 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#188K
#157K among extensions
Version
1.0.0
updated 3 Dec 2025

Users

monthly, 11 months
0613Nov 2025May 2026Oct 2026
Latest, 17 Oct 2026: 11 usersMove the mouse over the chart for any month

Ratings count

monthly, 11 months
001Nov 2025May 2026Oct 2026
Latest, 17 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Thumblr - YouTube Thumbnail Preview

Thumblr Extension - Preview Your Thumbnails on YouTube See exactly how your thumbnails will look on YouTube before publishing. Thumblr lets you preview AI-generated thumbnails directly in the YouTube interface. HOW IT WORKS: 1. Generate thumbnails on thumblr.io 2. Open the extension on YouTube 3. Drag & drop thumbnails onto the YouTube homepage 4. See your thumbnail displayed as a real video card KEY FEATURES: • Realistic Preview - Your thumbnail appears as a native YouTube video card with title, channel name, views, and duration • Drag & Drop - Simply drag thumbnails from the extension and drop them anywhere on YouTube's video grid • Hide UI Mode - Toggle off the Thumblr badge to see exactly how your thumbnail looks without any overlay • Screenshot - Capture the YouTube page with your thumbnail inserted to share or compare designs • Seamless Integration - Works on YouTube homepage and subscription feeds REQUIREMENTS: - A Thumblr account (thumblr.io) - Generated thumbnails in your Thumblr library Perfect for YouTubers, content creators, and marketers who want to A/B test their thumbnail designs before publishing. Made with ❤️ by Thumblr

Growth

WindowUsersChangeRatingsRating
7 days−2−15.4%00.00
30 days−1−8.3%00.00
6 months+9+450.0%00.00

Version history

2 versions recorded
1.0.03 Dec 2025
0.1.030 Nov 2025

Details

Category
Workflow & Planning
First seen
30 Nov 2025
Size
71 KB
Languages
en-US
Pricing
Free
Privacy policy
thumblr.io
Support
thumblr.io
Extension ID
pbcdcaaflcggikaeldjcjoafpbhpgmbc

Permissions and risk

Low riskimpact 2, likelihood 1
Permissions
storageactiveTabtabs
Site access
https://thumblr.io/*https://*.thumblr.io/*http://localhost:3000/*

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