YouTube Thumbnail Preview
Upload a thumbnail and see it beside sample videos in a mock feed — in light or dark mode, at desktop and phone sizes — so you can judge readability before publishing.
Runs 100% in your browser · nothing you enter is uploaded
How to use it
- Upload your thumbnail (1280×720 recommended).
- Enter title, channel name and stats.
- Switch layouts and themes to compare.
Questions
Is this the real YouTube?
No — it is an independent mock layout for previewing; no data is sent anywhere.
What size should thumbnails be?
1280 × 720 px, 16:9, under 2 MB, JPG/PNG/GIF.
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