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YouTube Thumbnail Tester

Upload a cover and type a title to see them exactly as viewers will: on the home page, in search results, in the suggestions sidebar and on a phone, in light or dark mode.

Using the YouTube Thumbnail Tester

1

Add your thumbnail

Choose a 1280×720 image or any 16:9 picture.

2

Type the title

Add your title and channel name to complete the preview.

3

Compare layouts

Switch between views and themes and tweak until it stands out.

Check these before upload

Small size

Is the main element still clear at phone size?

Both themes

Does it stand out on white and on dark backgrounds?

Time stamp

Is anything important hidden under the duration label?

Title cut-off

Does the key part of the title survive truncation?

YouTube Thumbnail Tester Questions & Answers

What size should a YouTube thumbnail be?
1280×720 pixels in 16:9, under 2 MB. Shrink larger files with our Image Format Converter.
Is my thumbnail uploaded?
No. The preview is drawn in your browser only.
Can I compare two thumbnails?
Swap the image to see alternatives in the same layout and pick the stronger one.
Is this connected to YouTube?
No. It is an independent preview tool and is not affiliated with YouTube.

Designing Thumbnails for Small Screens

Most people see your thumbnail at the size of a postage stamp, next to dozens of others. A thumbnail tester shows you that real context before you publish, so you can fix problems while it is still easy.

What tends to work

  • One clear subject, often a face with a strong expression.
  • Three words or fewer of large text.
  • Strong contrast between subject and background.

Grab a sharp still from your footage with the Video Frame Extractor, size it with the Social Image Resizer and write a matching title with the AI Title & Tag Writer.

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