YouTube Thumbnail Preview & Tester — Test Thumbnails Before You Upload · YT Thumbnail Preview<br>Ads and your choice<br>This tool is free and funded by ads. With your consent, our advertising partner Adsterra may store and read information on this device to show and measure ads. If you refuse, the site works exactly the same — you simply won't see ads. You can change your choice at any time from the footer.<br>PrivacyCookiesAdsterra privacy policy<br>Accept adsRefuse ads

See your thumbnail in the feed — before you upload.<br>Drop in your thumbnail and preview it against real competitors in Home, Search and Suggested, on desktop and mobile. Free, instant, and 100% private: nothing leaves your browser.

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HomeSearchSuggested<br>DesktopMobile<br>Niche packsTech BusinessFaith & WellnessFashion & BeautyFinanceFoodGamingHealth & FitnessPoliticsScienceTechTravel<br>AllClear

↻ Reshuffle Highlight mine<br>＋ My thumbnails<br>No competitor videos loaded yet.<br>My thumbnailsMy thumbnails

Channel avatarUploadRemove<br>Pick one or more of your own thumbnails with the “＋ My thumbnails” button. Give each a title; they’ll appear mixed into every view and persist across reloads.

Preview your thumbnail in 3 steps<br>Pick one or more niche packs — or import your own competitor list (CSV).<br>Add your thumbnails with “＋ My thumbnails”, paste one (Ctrl/Cmd+V), or drop an image anywhere.<br>Compare Home, Search and Suggested on desktop and mobile.<br>Try the “Tech” pack

Drop images to add them as your thumbnails

Import your competitors

Load the videos you want to compare against from a CSV file. Importing replaces the current competitor list; your own thumbnails are never touched.<br>One video per row, three columns in this exact order: videoUrl, title, channel.<br>videoUrl: a full YouTube link (watch?v=…, youtu.be/…, /shorts/…) or just the 11-character video ID.<br>Separator: comma or semicolon — both are detected automatically.<br>Header row optional; if you include one, its first cell must contain “url”, “video” or “link”.<br>title and channel can be left empty (they show as “(untitled)” / “Unknown”), but real values make the preview far more useful.<br>If a field contains the separator or quotes, wrap it in double quotes and write "" for a literal quote (standard CSV, RFC 4180).<br>Plain text, UTF-8. Duplicate videos are ignored; invalid rows are skipped and counted in the status bar.<br>Example of a valid file:<br>videoUrl,title,channel<br>https://www.youtube.com/watch?v=dQw4w9WgXcQ,Never Gonna Give You Up,Rick Astley<br>https://youtu.be/jNQXAC9IVRw,"Me at the zoo, remastered",jawedChoose a CSV file

Let AI do it — copy the prompt<br>Data in another format? Copy the prompt above, paste it into ChatGPT, Claude or any assistant together with your file, and you'll get back a ready-to-import CSV.<br>Competitor thumbnails, titles and channel names in the simulated feed belong to their respective owners and are loaded from YouTube's public image servers, shown here only so you can compare your own design against them. This site is not affiliated with YouTube or Google. Rights holders can request removal at our contact address.

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How it works<br>1Pick your competition<br>Choose one or more niche packs of real videos, or import your own competitor list from a CSV file.

2Add your thumbnail<br>Upload, paste (Ctrl/Cmd+V) or drag & drop your design. Give it a title and your channel name.

3Compare everywhere<br>Flip through Home, Search and Suggested on desktop and mobile, reshuffle the feed, and see if your thumbnail wins the click.

Why preview a thumbnail before uploading?<br>Click-through rate decides how far YouTube spreads your video, and the thumbnail drives most of that decision. But a design that looks great full-screen in your editor competes in the wild at a fraction of the size, sandwiched between rival videos, often in dark mode.<br>Previewing your thumbnail in a realistic feed shows you what viewers actually see — how it reads at small sizes, whether it stands out next to the competition, and whether title and image work together — before the upload is live and the first impressions are spent.

YouTube thumbnail specs<br>Resolution1280 × 720 px (minimum width 640 px)<br>Aspect ratio16:9<br>Max file size2 MB<br>FormatsJPG, PNG, WebP (non-animated)<br>Keep faces and text away from the bottom-right corner — the video duration badge covers it. Test readability at small sizes: most impressions happen in feeds, not full screen.

Frequently asked questions<br>Is my thumbnail uploaded anywhere?No. Everything runs in your browser. Your images, titles and lists never leave your device — there is no server to send them to.<br>How do I test my YouTube thumbnail before uploading?Add your thumbnail image, pick a niche pack or import competitor videos, and compare how your design looks in Home, Search and Suggested feeds on desktop and mobile.<br>Can I compare against real videos in my niche?Yes. Built-in niche packs contain real competitor videos and can be combined — tick Gaming and Finance to compare against a...