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Free thumbnail preview

See your thumbnail at a smaller size.

Choose your own image to inspect its dimensions, file size and readability at two preview widths. Your file stays in your browser.

Your image stays in this browser. This tool makes no upload request and adds no score or predicted click-through rate.

How to use the preview

  1. Select your own JPG, PNG or WebP image.
  2. Check the reported width, height and byte size.
  3. Look at the 320px and 168px previews without zooming.
  4. Review the subject, important details and any headline text.

What to look for

Can you recognize the central subject? Does the image communicate one idea? If text becomes hard to read, simplify it or review the composition. Keep the actual video title beside you so you can check the message the pair creates.

What the preview does not measure

This tool does not analyze your audience or connect to YouTube. It does not assign a thumbnail score, predict click-through rate or verify upload eligibility. Use the export checklist and current platform guidance before publishing.

Privacy

The selected file is displayed with a local browser object URL. It is not sent to Thumbish’s server, saved to an account or used for image generation. Closing the page releases the preview.

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