On YouTube, image dimensions matter much more than they do on most platforms. Get the thumbnail wrong and your click-through rate suffers in a way you can measure. Get the channel banner wrong and your branding looks broken on TVs, where a real portion of your audience watches.
Quick reference
- Video thumbnail: 1280 by 720 pixels (16:9). Max file size 2MB.
- Channel banner: 2560 by 1440 pixels. Safe area for the centre 1546 by 423 pixels.
- Profile photo: 800 by 800 pixels (displayed as a circle, around 98 by 98 in most contexts)
- Watermark / branding: 150 by 150 pixels minimum, transparent PNG
- Shorts cover: 1080 by 1920 pixels (9:16)
Thumbnails: the only image that drives clicks
Thumbnails are the most important image you upload to YouTube. They have a direct, measurable effect on click-through rate, which the algorithm uses as a major ranking signal. Spend disproportionate effort here.
Dimensions: 1280 by 720 pixels is the standard. Going higher does nothing useful because YouTube downscales for most display contexts. Going lower is forbidden, YouTube rejects thumbnails under 640 by 360.
Max file size is 2MB. Stay well under it. A typical thumbnail at quality 85 is 100 to 300KB.
Format: JPG, PNG, GIF and BMP all work. Use JPG for photographs, PNG for designs with text or transparency. WebP is not currently supported for thumbnail uploads.
Channel banner and the safe area
This is where most channels look amateur. The banner is shown at wildly different sizes depending on where it is viewed: phone, laptop, TV. YouTube does not show the same crop everywhere.
Upload at 2560 by 1440 pixels. The safe area, the part guaranteed to be visible on every device, is the centre 1546 by 423 pixel rectangle. All important content (channel name, branding, schedule) must fit inside that box. Everything outside the safe area is decorative and may be cropped on smaller screens.
Treat the banner as a tiered design. The 1546 by 423 inner block is what most viewers see. The full 2560 by 1440 is only ever shown on a TV. The middle is what laptop viewers get. Design from the inside out.
Profile photo
Upload at 800 by 800 pixels, square, JPG or PNG. YouTube displays it as a circle at much smaller sizes, typically 98 to 176 pixels. Anything that touches the edge of a square frame will be clipped. A logo with hard corners will look broken.
Test the round crop before uploading. Most editors have a circle preview function. Use it.
Shorts
Shorts use a 9:16 vertical canvas at 1080 by 1920 pixels. The visible safe area is similar to Instagram Stories: top 200 pixels and bottom 400 pixels are likely to be covered by UI. Keep titles and faces in the middle.
Shorts thumbnails specifically have their own quirk. YouTube picks a frame from your video as the thumbnail and you can change it within limited bounds. The custom thumbnail option for Shorts is rolling out gradually, do not rely on it.
What makes a thumbnail get clicks
Dimensions are necessary, not sufficient. A few practical things:
- Use 2 to 4 colour brand consistency across thumbnails. Viewers learn to recognise your channel at a glance.
- One face, looking at the camera, with an expression. Faces with strong expressions outperform everything else for most niches.
- Text should be no more than 3 to 5 words, in a font readable at 200 pixels wide. That is the size your thumbnail shows at on a phone's subscriptions feed.
- High contrast between text and background. Test by viewing the thumbnail at 240 wide. If anything is unreadable, fix it.
Common mistakes
- Designing thumbnails for desktop viewing. Most viewers see them on a phone. Aim for the small size first.
- Banners with critical text outside the safe area. It gets cropped on laptops and phones.
- Profile photos with hard corners. Round crop eats them.
- Uploading 4K thumbnails. Nothing happens. YouTube downscales.
Tools
Use our social media cropper for one-click thumbnail and banner sizing. The YouTube Thumbnail preset crops and resizes to 1280 by 720 exactly. The Channel Banner preset gives you the full 2560 by 1440 with markers for the safe area in the middle. For compressing thumbnails before upload, the compressor hits the under-2MB target easily.