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.
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.
Choose one or more niche packs of real videos, or import your own competitor list from a CSV file.
Upload, paste (Ctrl/Cmd+V) or drag & drop your design. Give it a title and your channel name.
Flip through Home, Search and Suggested on desktop and mobile, reshuffle the feed, and see if your thumbnail wins the click.
One image, five surfaces — each one crops it differently, shrinks it differently and covers part of it with something else. Every link opens the preview already in that context.
Large cards in a grid, several to a row, with the avatar and two lines of title underneath.
One card per row at the full width of the screen, and a title that wraps somewhere else than on desktop.
A wide row: the image on the left, the title, channel and description beside it.
The same results stacked — full-width image, title under it, less room for the words.
The smallest card there is: a narrow column beside the player, where fine text goes first.
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.
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.
Keep faces and text away from the bottom-right corner — the video duration badge covers it. The safe zone map has every surface measured, and the size guide covers what YouTube does to the file after upload.
No. Everything runs in your browser. Your images, titles and lists never leave your device — there is no server to send them to.
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. The pre-upload checklist is the same pass written out step by step.
Yes. Built-in niche packs contain real competitor videos and can be combined — tick Gaming and Finance to compare against a shuffled mix of both — or you can import your own list, a simple CSV with video URL, title and channel.
16:9, with 3840 × 2160 recommended and 1280 × 720 perfectly adequate; minimum width 640 px. The file limit is 50 MB from a computer and 2 MB from the phone, as JPG or PNG. The size guide has the details.
Competitor titles and thumbnails are real; view counts, ages and search snippets are simulated. They stay stable per video so comparisons remain fair, and reshuffle regenerates them.
Yes — toggle Desktop / Mobile to preview inside a phone-sized YouTube layout, where thumbnails render even smaller and details matter more. The mobile guide measures how small that actually is.
Completely free, no account needed. And right now there are no ads either.
Along with the title, the thumbnail is the main thing a viewer sees before deciding to click. Higher click-through rates tell YouTube to show your video to more people — what CTR is and is not goes through the numbers.
This tool has no backend. Your images are handled with local browser APIs, stored only in your browser's own storage, and are gone the moment you clear it. The only outside requests are for competitor thumbnails, loaded directly from YouTube's public image servers.