HD Thumbnail Grabber by ThumbHD

One click on any video takes you straight to ThumbHD with the HD thumbnail ready to download, plus a free CTR analysis — contrast, clutter, safe zones.

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About this extension

HD Thumbnail Grabber adds a button to YouTube video and Shorts pages. Click it and ThumbHD opens in a new tab with that video's thumbnail already loaded, ready to download in HD. No copying links, no pasting.

HOW IT WORKS
1. Open any YouTube video or Short
2. Click the HD Thumbnail button next to Like and Share
3. ThumbHD opens in a new tab with your download options ready

On ThumbHD you can download the thumbnail and run free analysis tools: contrast, clutter, safe zones, and a CTR check.

PRIVACY
This extension collects no data. When you click the button, it opens thumbhd.com with the video's ID in the link. Nothing else is sent anywhere.

Not affiliated with YouTube or Google LLC.

Developer comments

WHAT IT DOES
The extension adds one button ("HD Thumbnail") to YouTube video and Shorts pages. Clicking it opens https://thumbhd.com/?v=<videoId>&src=extension in a new tab. thumbhd.com is my own site, and it loads that video's thumbnail with download options ready. The extension does not download, fetch or process anything itself.

HOW TO TEST (no account or login needed)
1. Open any YouTube video, for example https://www.youtube.com/watch?v=dQw4w9WgXcQ
2. The "HD Thumbnail" button appears in the action row, just before the Share button. If YouTube changes its layout and the row cannot be found, the button falls back to a floating button in the bottom-right corner.
3. Click it. A new tab opens at thumbhd.com with that video's thumbnail loaded.

PERMISSIONS AND DATA
- No permissions are requested, and there are no host permissions.
- The only access is a content script that runs on youtube.com/watch, youtube.com/shorts/ and the m.youtube.com equivalents. It reads the video ID from the page URL and injects the button.
- There is no background script, no storage, and no network requests from the extension itself.
- The extension collects and transmits no user data. The manifest declares data_collection_permissions "none".
- When the user clicks the button, the video ID is passed to thumbhd.com in the URL. The src=extension parameter only labels the visit as coming from the extension. The website may count the visit in its standard site analytics, but the extension does not collect anything.

CODE
- There is no remote code, no eval, and no external scripts or libraries.
- There is no minified or generated code and no build step. The submitted files are the hand-written source: manifest.json, content.js, content.css and icons.

OTHER
- The extension ID is hd-thumbnail-grabber@thumbhd.com.
- The name does not use the YouTube trademark, and the listing states that it is not affiliated with YouTube or Google LLC.
- Privacy policy: https://thumbhd.com/legal/privacy-policy
- Contact: adminthumbhd@gmail.com

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HD Thumbnail Grabber by ThumbHD

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