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YouTube thumbnail previewer

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Fit width shrinks the preview to your window. Actual size is 100%—judge readability at true interface size, with scrolling if needed.

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Desktop · 1280 pxRepresentative layout · Not affiliated with YouTube

Local means local.

Selected images, filenames, and the titles you enter stay in this browser. They are never uploaded or sent to analytics.

We keep your preview settings on this device. Your artwork and titles are only held for this session and clear when you reload or close the page. Your original files are never modified.

Cloudflare and our host process ordinary connection information to deliver and protect the site. We use aggregate page, referral-source and crawler counts; we do not build visitor profiles. We do not use visitor profiles, tracking cookies, accounts, or image-upload services.

We count anonymous page views, feature use and broad time-on-page ranges to improve this site. We do not store visitor IDs or browsing histories. You can turn these counts off in Privacy & usage counts at the foot of this page.

There are no daily quotas or file-size paywalls. Extremely large pixel dimensions may exceed the previewer’s memory safeguards; we explain that when it happens.

Surrounding videos are fictional samples using Unsplash and Pexels photos, served with the app. Photo credits (opens a new tab)

Check your YouTube thumbnail before publishing

Use this free thumbnail checker to see your image and title together in representative Home, Search and Suggested layouts. Switch between desktop and mobile, try light and dark mode, and see how your design looks beside other videos.

Compare the whole idea

Add several images and give each its own title. Switch versions while the surrounding videos stay fixed. Download a PNG comparison of two to four versions when you want to review them together.

Keep your drafts private

Choose JPG, PNG or WebP files from your device. Your images and entered titles stay in this browser, with no account or uploads. Keep your originals: this editing session clears when you reload.

Check the design at viewing size

Look for readable text, a clear subject and important details hidden by the duration badge. This thumbnail tester helps you judge the design; it does not predict click-through rate or run an audience test.