What size should a YouTube thumbnail be in 2026?

YouTube recommends 3840 × 2160 pixels at a 16:9 aspect ratio, with a minimum width of 640 pixels. The long-standing 1280 × 720 is still valid and still displays correctly everywhere — it is simply no longer the recommended maximum, because thumbnails now render on 4K television screens where the extra resolution shows.

Is the YouTube thumbnail file size limit 2 MB or 50 MB?

Both, depending on where you upload from. YouTube's limit depends on the device: 2 MB for video thumbnails uploaded on mobile, 10 MB for podcast thumbnails on mobile, and 50 MB for either on desktop. Most guides still quote a flat 2 MB, which has not been the whole picture for some time. If a large thumbnail is rejected, upload it from a desktop browser.

Is 1280 × 720 still fine for a YouTube thumbnail?

Yes. 1280 × 720 is the same 16:9 ratio, well above the 640 px minimum width, and looks identical to a 4K file on phones and laptops. The difference appears only on large high-resolution displays. A JPG at quality 85–90 at that size lands comfortably under even the 2 MB mobile limit.

Why does my YouTube thumbnail look blurry?

Usually one of three things: the image was under 640 px wide and got upscaled; it was saved at a low JPG quality to squeeze under the 2 MB mobile limit; or it was exported at the wrong aspect ratio and YouTube cropped and rescaled it. Export at 16:9, keep the width at 1280 px or more, and upload from desktop if the file is large.

What size is an Instagram Reels cover?

1080 × 1920 pixels, 9:16. The catch is the profile grid, which crops that to 4:5 (1080 × 1440). Keep your subject and any text inside the centred 1080 × 1080 square so it survives every crop, and stay out of the bottom ~320 pixels where the caption and audio ticker are drawn.

What size is a TikTok cover photo?

1080 × 1920 pixels at 9:16, the same as the video. Compose towards the upper-left: the action buttons run up the right-hand side and the caption sits across the bottom.

Do YouTube Shorts need a separate thumbnail?

Shorts use a 9:16 cover at 1080 × 1920 rather than the 16:9 thumbnail a standard video uses. If you publish the same video in both formats you need both images, which is why generating every size in one pass is worth doing.

Specifications

YouTube, TikTok and Instagram Reels thumbnail sizes in 2026

YouTube recommends 3840 × 2160 pixels at a 16:9 aspect ratio, with a minimum width of 640 px. The long-standing 1280 × 720 is still valid and still displays correctly everywhere. Instagram Reels covers and TikTok cover photos are both 1080 × 1920 at 9:16, as are YouTube Shorts covers.

YouTube's file size limit depends on the device you upload from: 2 MB on mobile for video thumbnails, 10 MB on mobile for podcasts, and 50 MB on desktop for either. Accepted formats are JPG, GIF and PNG.

Verified against the platforms' own documentation on 26 July 2026.

Every size, in one table

Platform	What it's called	Recommended	Ratio	Formats	Max file size
YouTube	Custom video thumbnail	3840 × 2160 pxmin 640 px wide	16:9	JPG, GIF, PNG	2 MB on mobile, 50 MB on desktop
YouTube	Podcast thumbnail	3840 × 2160 px (1:1 for podcast playlists)min 640 px wide	16:9, or 1:1 for a podcast playlist	JPG, GIF, PNG	10 MB on mobile, 50 MB on desktop
YouTube Shorts	Shorts cover	1080 × 1920 px	9:16	JPG, PNG	As above — Shorts use the same thumbnail limits
Instagram Reels	Reel cover	1080 × 1920 px	9:16	JPG, PNG	No published limit — covers are cropped, not rejected
TikTok	Video cover photo	1080 × 1920 px	9:16	JPG, PNG	No published limit

Is the limit 2 MB or 50 MB?

Both — it depends on where you upload from, which is why you will find guides confidently stating each figure. YouTube's documented limits are 2 MB for a video thumbnail uploaded on mobile, 10 MB for a podcast thumbnail on mobile, and 50 MB for either from desktop. Most size guides still quote a flat 2 MB, which has not been the full picture for some time.

The practical upshot: if YouTube rejects a large thumbnail, open the desktop site and upload it there. And if you are compressing hard to squeeze under 2 MB, you are throwing away quality for a limit that may not apply to you.

Safe zones — where covers actually get cut

The canvas size is the easy part. Nearly every “why does my cover look wrong” problem is a crop or an overlay, not a dimension — and most size guides stop before this section.

YouTube — The timestamp sits bottom-right
The duration badge overlays the lower-right corner in every feed. Keep faces and text out of roughly the bottom-right 15%.
YouTube — Design for 210 px wide, not 1280
A sidebar suggestion renders around 168–246 px across. If the text is unreadable when you shrink the image to thumbnail-of-a-thumbnail size, it is unreadable where it counts.
Instagram Reels — The profile grid crops to 4:5
You upload 1080 × 1920 (9:16), but the grid shows 1080 × 1440. Anything above or below that centre band is invisible on your profile.
Instagram Reels — Keep the subject in the centre 1080 × 1080
That square survives every crop Instagram applies across the grid, the feed and Explore.
Instagram Reels — Avoid the bottom ~320 px
The caption, account name and audio ticker are drawn over it in the feed.
TikTok — The right rail and caption eat the edges
Action buttons run up the right side and the caption sits across the bottom. Compose to the upper-left two thirds.

Frequently asked questions

What size should a YouTube thumbnail be in 2026?: YouTube recommends 3840 × 2160 pixels at a 16:9 aspect ratio, with a minimum width of 640 pixels. The long-standing 1280 × 720 is still valid and still displays correctly everywhere — it is simply no longer the recommended maximum, because thumbnails now render on 4K television screens where the extra resolution shows.
Is the YouTube thumbnail file size limit 2 MB or 50 MB?: Both, depending on where you upload from. YouTube's limit depends on the device: 2 MB for video thumbnails uploaded on mobile, 10 MB for podcast thumbnails on mobile, and 50 MB for either on desktop. Most guides still quote a flat 2 MB, which has not been the whole picture for some time. If a large thumbnail is rejected, upload it from a desktop browser.
Is 1280 × 720 still fine for a YouTube thumbnail?: Yes. 1280 × 720 is the same 16:9 ratio, well above the 640 px minimum width, and looks identical to a 4K file on phones and laptops. The difference appears only on large high-resolution displays. A JPG at quality 85–90 at that size lands comfortably under even the 2 MB mobile limit.
Why does my YouTube thumbnail look blurry?: Usually one of three things: the image was under 640 px wide and got upscaled; it was saved at a low JPG quality to squeeze under the 2 MB mobile limit; or it was exported at the wrong aspect ratio and YouTube cropped and rescaled it. Export at 16:9, keep the width at 1280 px or more, and upload from desktop if the file is large.
What size is an Instagram Reels cover?: 1080 × 1920 pixels, 9:16. The catch is the profile grid, which crops that to 4:5 (1080 × 1440). Keep your subject and any text inside the centred 1080 × 1080 square so it survives every crop, and stay out of the bottom ~320 pixels where the caption and audio ticker are drawn.
What size is a TikTok cover photo?: 1080 × 1920 pixels at 9:16, the same as the video. Compose towards the upper-left: the action buttons run up the right-hand side and the caption sits across the bottom.
Do YouTube Shorts need a separate thumbnail?: Shorts use a 9:16 cover at 1080 × 1920 rather than the 16:9 thumbnail a standard video uses. If you publish the same video in both formats you need both images, which is why generating every size in one pass is worth doing.

Sources

Get every size from one video

Thumbn watches your video, finds the frame worth using, and renders it at 1280 × 720 for YouTube and 1080 × 1920 for Reels, TikTok and Shorts — composed inside the safe zones above, in one pass.

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