Thumbnail Preview Tool

Preview Your Thumbnail Before Publishing

Upload an image, add text overlay, and see exactly how your thumbnail looks at every YouTube size — homepage, search results, and mobile.

Last updated: February 2026

Homepage

360 x 202

Search Result

246 x 138

Mobile

168 x 94

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Real YouTube Sizes

See your thumbnail at the exact sizes YouTube uses — homepage, search, and mobile.

Text Overlay

Add bold text with custom colors, sizes, and outlines — no Photoshop needed.

Instant Download

Download your thumbnail preview as a PNG file. Everything runs in your browser — no uploads.

Frequently Asked Questions

YouTube recommends 1280x720 pixels (16:9 aspect ratio) with a minimum width of 640 pixels. Files should be under 2MB in JPG, GIF, or PNG format. Our preview tool shows you how your thumbnail looks at this size and at the smaller sizes YouTube actually displays.
Use contrasting colors, bold text (3-5 words max), expressive faces, and minimal clutter. The most important test is whether your thumbnail is readable at mobile size (168x94 pixels). Use our preview tool to check before publishing.
No. Everything runs entirely in your browser using the HTML Canvas API. Your images are never uploaded to any server. The preview and download happen locally on your device.

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