YouTube Thumbnail Preview

Preview your custom thumbnails directly on YouTube before uploading. See how it will look live. Free tool by mivibzzz.com

As of June 2026, YouTube Thumbnail Preview has 43 users and a 5.00/5 rating from 2 reviews in the Productivity category.

Productivity

Chrome Web Store ↗.crx

Users+65.4%

Rating0%

5.00

2 reviews

Reviews+100.0%

Version

2.0.0

Manifest V3

History

6 snapshots

Tracking since Apr 4, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 4, 2026	26	5.00	1	2.0.0
Apr 25, 2026	30	5.00	1	2.0.0
May 9, 2026	36	5.00	2	2.0.0
May 17, 2026	34	5.00	2	2.0.0
May 26, 2026	35	5.00	2	2.0.0
Jun 4, 2026	42	5.00	2	2.0.0
Now	43	5.00	2	2.0.0

Permissions & access

Permissions: activeTab
Host access: *://*.youtube.com/*

Screenshots

About

Test your Thumbnails in Real Time directly on YouTube!

Step 1 - Upload your Thubnail to the extension.
Step 2 - Add your Title & Chanel Name!
Step 3 - Click "Apply Preview" to see your Thumbnail as it will look on YouTube!

You can reset the Extension and Try Multiple Thumbnails!
You can try different titles!
Run a quick test to see how your Thumbnails will look on any Youtube Page!

To see how it will look on Mobile you can adjust your screen to see how it will show up on a device with a vertical screen resolution!

YouTube Thumbnail Preview by Mivi will replace a random video's Thumbnail/Title/Channel Name so you can scroll up and down and see how your Thumbnail stacks up against the competition!

To Use the Features you must have a subscription. After you have created your subscription, refresh the YouTube Home page if you were on it already so extension refreshes with your account.

After that upload and start clicking! Change the full page to have your Thumbnail if you want! Each click executes one change to a random video, the more times you click the more videos will change. Sometimes it will "change" a video it has already changed so some clicks might feel like they haven't done anything, that is because it is set to change a random video to recreate the feel of your own Thumbnail being displayed on YouTube!

The benefit is that you get to use your own home page and YouTube profile so you can get a feel of how it will actually look. If you were to use a generic YouTube replica background the videos that are next to your testing extension would have thumbnails that are not catered to your actual profile. With this extension you get to see how your extension will look in the context of your profile and your preferences which is key to having a good benchmark!

Learn more about how you can grow you online presence at https://mivibzzz.com/

GOOD LUCK WITH YOUR VIDEOS!