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YouTube Thumbnail Tester

Preview up to 3 thumbnails side-by-side at the real sizes viewers see — mobile feed, desktop sidebar, search and channel grid. Pick the winner before you publish.

  • Runs in your browser
  • No upload on server
  • Free, forever
  1. Add content
  2. Style
  3. Copy / download
How this works
  1. 1
    Drop your thumbnail

    Upload the image you'd use on YouTube — landscape 16:9 works best.

  2. 2
    Preview at real sizes

    See how it looks in search, sidebar and home feed — most viewers see the small version first.

  3. 3
    Compare variants

    Load two thumbnails side by side to spot which one reads better at a glance.

Watch: differences light up between two inputs
How this works
    Great thumbnails still read at 168 px. Add one, two or three versions and check that faces, text and the main subject are still clear at the smallest size. Whichever version wins the 168 px test is the one to publish.

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