YouTube Thumbnail Preview & Resizer

Preview thumbnail readability at phone size, resize to 16:9, and export a JPG under 2 MB. Images stay in your browser.

Free creator tool · no account required

Catch tiny text before it goes live, then make a clean 16:9 JPG for upload.

1. Add a thumbnail

Choose an image from your device. It stays in this browser preview; it is not uploaded.

Tip: check that the main subject and any words are easy to recognize at a glance.
Image sizeWaiting for image
File size—
Add an image to see its preview and checks.
  • Image dimensions and ratio will appear here.
  • The small preview is illustrative, not an exact YouTube screen.
Private by design: previews are made in your browser memory. The page does not send image files to a server. Refreshing or closing the page clears them.

2. Check it at small size

The thumbnail is reduced in a sample video-card layout so you can judge the big shapes and text at a glance.

Thumbnail A—
Your image will appear here
Reduced-size readability preview

A strong preview makes the subject and key words easy to pick out when reduced. This tool checks dimensions and shows a small-size view; it does not score design quality or predict views, clicks, or YouTube performance.

3. Resize and download

Choose A or B, fit it to a 16:9 video thumbnail, and export a JPG sized for YouTube. The tool tries to stay below your chosen file-size target.

YouTube currently allows up to 2 MB for video thumbnails uploaded from mobile and up to 50 MB from desktop. This export targets less than 2 MB so it is ready for either route. It uses JPG to keep file size manageable.

Choose an image first, then click “Resize and prepare JPG.” The download button appears here when the JPG is ready. If the 2 MB target requires reducing the selected dimensions, the final dimensions will be shown before download; review the image for softness or crop changes.

Output: 1280 × 720File size: —
Choose an image above to enable resizing.
The Click Test · Try it before you upload it

Watch the short walkthrough

Want a quick look at how this works? The video below shows how to check a thumbnail at phone size, resize it, and download the finished JPG.